Fish Compatibility Chart

Yes, albino plecos and cherry shrimp share a 30-gallon tank comfortably, with the pleco grazing the bottom and the shrimp colonizing surfaces.

• Albino plecos are 5-inch bottom dwellers while cherry shrimp are 1-1.5-inch surface and biofilm grazers, so they do not compete for space.
• Temperature overlap spans 72-80°F and pH overlap is 6.5-7.5, a range both species tolerate well.
• Albino plecos are nocturnal and rest during the day when shrimp are most active, minimizing interaction.
• Cherry shrimp add negligible bioload, so a 30-gallon tank with one pleco and a shrimp colony has plenty of capacity.

Minimum shared tank: 30+ gallons

No, adult angelfish eat amano shrimp. A 2-inch shrimp fits in an angelfish mouth and becomes a snack.

• Amano shrimp grow to 2 inches. Angelfish grow to 6 inches long and 8 inches tall, with mouths wide enough to swallow a shrimp whole.
• While a juvenile angelfish might ignore shrimp, the angel grows fast and the predation risk increases every month.
• Shrimp are vulnerable during molting. An angelfish will target a freshly molted shrimp with no defensive shell.

Minimum shared tank: 30+ gallons

Yes, amano shrimp and betta fish coexist well in a 10-gallon tank with temperatures of 76-80F and a pH of 6.5-7.5.

• Amano shrimp are larger than most ornamental shrimp and move quickly, making them unappealing as prey to bettas.
• Betta fish typically ignore amano shrimp since the shrimp do not resemble the small, slow-moving creatures that trigger betta feeding responses.
• Both species thrive in the same temperature range of 76-80F, which is ideal for bettas and comfortable for amano shrimp.
• Amano shrimp are effective algae and detritus eaters, adding cleaning value to the tank without competing with the betta.
• A 10-gallon tank gives the shrimp enough space to find hiding spots among plants and decor if the betta ever becomes curious.

Minimum shared tank: 10+ gallons

These species have no meaningful conflict and can thrive together under the right conditions.

• Water parameters overlap well. Cardinal Tetras prefer 73 to 81 degrees Fahrenheit and Amano Shrimp do fine at 70 to 80 degrees Fahrenheit, giving a comfortable shared range of 73 to 80 degrees. pH overlap spans 6.5 to 7.0, which is acceptable for both species.
• Neither species threatens the other. Both max out at 2 inches and Cardinals are peaceful schooling fish, not predators that would target adult shrimp. Amanos are too large and assertive to be easy prey for small tetras either. No predatory conflict exists.
• They occupy different swimming levels. Amanos are bottom-dwelling scavengers while Cardinals are mid-level schooling fish, which reduces competition for space and natural food sources. Amanos will clean up leftover flakes and biofilm that drift to the substrate without bothering the tetras.
• Both compatibility lists include small shrimp species as acceptable tankmates, and Cardinal Tetras specifically appear on the Amano Shrimp compatibility list, indicating these pairings have been successfully kept together by aquarists.

Minimum shared tank: 15+ gallons

No, discus need 82-88F while amano shrimp thrive at 70-78F, creating a temperature conflict that harms both species.

• Amano shrimp require 70-78F for long-term health and longevity.
• Discus need 82-88F and suffer immune problems when kept at temperatures below 82F.
• There is no overlap between these ranges, so one species will always be stressed.
• Amano shrimp also need brackish water for breeding, which conflicts with the soft freshwater discus prefer.
• Warm water speeds up amano shrimp metabolism and shortens their lifespan significantly.

Minimum shared tank: 55+ gallons

Amano shrimp and dwarf gouramis can coexist successfully when given adequate space and cover.

• The water parameter ranges for both species show strong overlap, with temperatures between 72 and 80 degrees Fahrenheit and pH ranges of 6.5 to 7.5 being suitable for both.
• Neither species lists the other as incompatible. Notably, dwarf gouramis are listed as compatible with cherry shrimp, which suggests they are not predisposed to preying on small invertebrates.
• Amano shrimp occupy the bottom level of the tank while dwarf gouramis occupy the top level, which naturally separates their primary activity zones and reduces direct interaction.

Minimum shared tank: 10+ gallons

No, German blue rams eat amano shrimp since rams are carnivorous dwarf cichlids that hunt small invertebrates in their territory.

• German blue rams at 2.5-3 inches are dwarf cichlids with strong carnivorous instincts and active hunting behavior.
• Amano shrimp reach 2 inches but have soft bodies and move slowly enough for a ram to catch.
• Rams spend their time near the bottom and substrate, the same area where amano shrimp forage.
• Shrimplets and juvenile amanos are especially vulnerable to ram predation even if adults sometimes survive.

Minimum shared tank: 20+ gallons

Amano Shrimp and Goldfish should not be housed together because their preferred temperature ranges do not overlap, and goldfish will readily eat shrimp small enough to fit in their mouths.

• The most immediate obstacle is temperature. Amano Shrimp require 70 to 80 degrees Fahrenheit, while goldfish require 60 to 72 degrees Fahrenheit. The overlapping range is only 70 to 72 degrees, which sits at the warm upper limit for goldfish and is cooler than ideal for Amano Shrimp. Goldfish kept long-term at the warm end of their range face increased stress and shortened lifespans.
• Goldfish are opportunistic omnivores that will eat anything small enough to fit in their mouths. Amano Shrimp reach a maximum size of only 2 inches and dwell at the bottom of the tank. This size and position makes them a natural target for goldfish, which are not classified as active hunters but are enthusiastic scavengers who investigate and consume slow-moving, small invertebrates.
• The published compatibility data reinforces this conflict. Amano Shrimp are not listed as compatible with goldfish, and goldfish are listed as incompatible with several comparably sized or smaller tankmates including betta, guppy, and neon-tetra. Amano Shrimp are also not listed as compatible with any coldwater species on their own compatibility list.
• The tank size requirement of 30 gallons for goldfish is adequate for the shrimp but does not resolve the fundamental thermal and predatory incompatibility.

Minimum shared tank: 30+ gallons

These two species share nearly identical water requirements and occupy different swimming levels, with the Honey Gourami being too peaceful and similarly sized to pose any meaningful threat to Amano Shrimp.

• Water parameters align closely: both species thrive in temperatures of 70 to 80 degrees Fahrenheit and a pH range of 6.5 to 7.5, creating a shared environment where neither species experiences stress from mismatched conditions.
• Swimming level separation eliminates direct competition: Amano Shrimp occupy the bottom of the tank while Honey Gourami reside in the upper levels, meaning they rarely interact in ways that could cause stress or conflict.
• Honey Gourami are documented as among the most peaceful gourami species, and at two inches they are the same size as Amano Shrimp, making predation on the shrimp highly unlikely even though gouramis are technically omnivores.

Minimum shared tank: 10+ gallons

Yes, amano shrimp and kuhli loaches coexist in 15 gallons or larger since both prefer slow-moving, planted tank setups.

• Amano shrimp reach 2 inches. Kuhli loaches grow to 3-5 inches. Size difference does not trigger predation because kuhli loaches are not shrimp hunters.
• Both tolerate 73-80F and pH 6.5-7.
• Kuhli loaches are bottom dwellers that sift substrate. Amano shrimp scavenge on surfaces and plant leaves, staying out of the loach path.
• Amano shrimp are bold and armored with spines along their tails. They are not easy prey for a loach that eats worms and sinking pellets.

Minimum shared tank: 15+ gallons

Amano Shrimp and Molly fish share enough environmental tolerance and behavioral separation to coexist successfully, though both require monitoring during initial introduction.

• Amano Shrimp and Molly occupy opposite swimming levels (bottom vs top), which naturally minimizes direct territorial conflict throughout the tank.
• Temperature and pH ranges overlap substantially, with Amano Shrimp tolerating 70 to 80 degrees Fahrenheit and 6.5 to 7.5 pH while Molly tolerates 72 to 82 degrees Fahrenheit and 7.0 to 8.5 pH, providing a shared comfortable zone within those parameters.
• Molly fish are not known predators of large invertebrate species, and Amano Shrimp at 2 inches are large enough to be generally ignored by adult mollies, unlike much smaller cherry shrimp which face higher predation risk.
• Neither species lists the other as incompatible, and Amano Shrimp boldness and assertiveness means they are unlikely to be easily intimidated by passive molestation from even a dominant male molly.
• Amanos are omnivores capable of competing for food, which means they will not go hungry in a community tank with mollies, reducing the likelihood of aggressive food-stealing disputes escalating into injury.

Minimum shared tank: 20+ gallons

Yes, amano shrimp and mystery snails coexist well in 10 gallons or larger, and both are excellent cleanup crew members for planted community tanks.

• Amano shrimp prefer 70-80 degrees Fahrenheit while mystery snails tolerate 68-82 degrees, giving them a solid shared range of 70-80 degrees.
• Amano shrimp reach 2 inches while mystery snails grow to 2-2.5 inches, so they are similar in size with no predator-prey dynamic.
• Both species occupy different vertical zones. Amano shrimp actively forage across plants, glass, and hardscape throughout the tank, while mystery snails primarily work the glass and substrate at a slower pace.
• Amano shrimp are bold enough to hold their own and mystery snails are large enough that neither will be bullied by the other.
• Both species tolerate pH 7.0-7.5, and neither has particular requirements that conflict with the other.

Minimum shared tank: 10+ gallons

Yes, amano shrimp and nerite snails coexist comfortably in 10 gallons or larger, and both are highly effective algae eaters for planted community tanks.

• Amano shrimp thrive at 70-80 degrees Fahrenheit while nerite snails prefer 72-80 degrees, giving them a shared range of 72-80 degrees.
• Amano shrimp reach 2 inches while nerite snails stay at 1 inch. The size difference is modest and nerites are protected by their hard shells.
• Both species actively graze on algae and biofilm, but amanos range throughout the tank while nerites work surfaces more methodically. They do not compete for the same food sources.
• Amano shrimp are bold enough to coexist with larger tankmates, and nerite snails move slowly enough that the two species simply ignore each other.
• Both tolerate pH 7.0-7.5, and both need calcium for healthy shells or exoskeletons, so mineral supplementation benefits both.

Minimum shared tank: 10+ gallons

Amano shrimp will almost certainly become a meal for an Oscar due to the extreme size difference and the Oscar's predatory nature.

• The Oscar's incompatibility list explicitly names cherry-shrimp, and Amano shrimp are similar in size and type, indicating the same predation risk applies.
• Oscars grow to 12-14 inches while Amano shrimp reach only 2 inches, creating an extreme size mismatch where the shrimp easily fits in the Oscar's mouth.
• Oscars are carnivores that will eat any animal protein they encounter, and the Amano shrimp's bold behavior of approaching fish to steal food makes them particularly vulnerable to being eaten.

Minimum shared tank: 75+ gallons

Yes, amano shrimp and otocincluses coexist in 10 gallons or larger since both are peaceful algae grazers that prefer the same water conditions.

• Amano shrimp grow to 2 inches and spend time on plants and hardscape. Otocincluses stay on glass and substrate at 2 inches.
• Both tolerate 72-79F and pH 6.5-7.5 without stress.
• Neither species defends territory or shows aggression toward the other.
• Amano shrimp are skilled algae removers. Otocincluses are specialist glass cleaners. They target different surfaces.

Minimum shared tank: 10+ gallons

These species can coexist in a properly sized planted tank with appropriate parameters.

• The Pearl Gourami occupies the top swimming level while Amano Shrimp stay at the bottom, creating natural spatial separation that minimizes direct contact between the species.
• Both species tolerate overlapping water parameters in the 77-80 degree Fahrenheit range, with acceptable pH overlap between 6.5-7.5, though the tank should be kept on the warmer end to satisfy the gourami.
• Pearl Gouramis are documented as genuinely peaceful fish for their size, and they are not listed as incompatible with invertebrates, while Amano Shrimp are notably bold and assertive rather than vulnerable or reclusive.
• A tank of at least 30 gallons provides adequate space for both species and reduces any competition for food or territory.

Minimum shared tank: 30+ gallons

Amano Shrimp and Platy share strong environmental overlap and occupy complementary zones of the tank, making them suitable tankmates in a properly maintained aquarium.

• Both species thrive in the same temperature range of 70 to 80 degrees Fahrenheit and can coexist in a tank as small as 10 gallons.
• Amano Shrimp occupy the bottom of the tank while Platy occupy the top, meaning they use entirely different zones and are unlikely to come into conflict over space or food.
• Neither species lists the other as incompatible. The Platy incompatibility with cherry-shrimp is specific to that smaller species, and Amano Shrimp are notably larger and more assertive than cherry shrimp, making them a harder target.

Minimum shared tank: 10+ gallons

Yes, amano shrimp and pygmy corydoras coexist well in a 10-gallon tank, with both species keeping to the bottom and avoiding each other.

• Amano shrimp grow to 2 inches and spend their time on the bottom foraging for algae, while pygmy corydoras at 1 inch hover just above them in the water column.
• Temperature overlap sits at 72-79F, with amanos preferring 74F and pygmies preferring 75F.
• pH ranges overlap cleanly from 6.5-7.4, covering both species' ideal conditions.
• Neither species shows aggression toward the other. Both are peaceful tankmates that focus on their own business.
• The minimum 10-gallon tank provides enough floor space for a group of amanos and a school of pygmies without crowding.

Minimum shared tank: 10+ gallons

Amano shrimp and rummy nose tetras are compatible with proper tank sizing and feeding management.

• Temperature and pH ranges overlap well, with a shared temperature window of 75 to 80 degrees Fahrenheit and pH overlap from 6.5 to 7.0, creating stable water conditions that suit both species.
• Neither species appears on the other is incompatibility list, and the rummy nose tetra is not a known predator of adult shrimp. Amano shrimp are bottom-dwelling scavengers while rummy nose tetras occupy the middle water column, reducing competition for territory.
• Amano shrimp are listed as compatible with similar community fish including neon tetras and cherry shrimp, indicating they coexist peacefully with schooling fish of comparable size when properly fed.

Minimum shared tank: 20+ gallons

Amano shrimp and swordtails can coexist because they occupy different swimming levels and have largely non-overlapping behaviors, though a spacious tank with plenty of cover is essential.

• Water parameters overlap sufficiently. Both species thrive in temperatures between 72 and 80 degrees Fahrenheit. Swordtails prefer a slightly higher pH range (7.0 to 8.3) while Amano shrimp prefer 6.5 to 7.5, but a middle ground around 7.0 to 7.5 works for both.
• Spatial separation reduces conflict. Amano shrimp are bottom-dwelling scavengers while swordtails are active top swimmers. They simply do not compete for the same areas of the tank, which significantly lowers the risk of direct confrontation.
• Neither species lists the other as incompatible. The Amano compatibility list includes small peaceful fish, while the swordtail compatibility list includes other community species. Neither entry flags the other as a threat, which is a meaningful signal when neither explicitly forbids cohabitation.

Minimum shared tank: 20+ gallons

Tiger Barbs are too aggressive and nippy for Amano Shrimp to live safely in the same tank.

• Tiger Barbs are documented as aggressive nippy fish that actively chase and harass tankmates, and their incompatibility list includes many peaceful species that share the same middle-swimming level.
• Amano Shrimp are bold and assertive, but they are primarily bottom-dwelling scavengers that cannot easily escape Tiger Barbs patrolling the middle water column.
• Neither species lists the other as compatible, and the Tiger Barb's well-known 'rowdy' chasing behavior poses a real risk to shrimp even though Amanos are larger than typical cherry shrimp.

Minimum shared tank: 20+ gallons

No, angelfish eat cherry shrimp. Full-sized angelfish can swallow adult neos, and even juveniles will pick off shrimplets from plants and surfaces.

• Angelfish grow to 6 inches and have a large, horizontally oriented mouth. Cherry shrimp are slow-moving and fit inside that mouth at any size above 0.5 inches.
• Angelfish are cichlids. Cichlids naturally browse for small invertebrates among rocks, plants, and driftwood, exactly where shrimp hide.
• Shrimp exposed on glass or plants face immediate predation. Angelfish do not need to hunt; they simply browse the tank throughout the day.
• Cherry shrimp stop grazing openly and lose condition when a predator patrols the tank. The shrimp colony contracts to hidden zones and does not expand.
• Temperature overlap 76-80F suits both species, but shared parameters do not resolve the predator-prey relationship.

Minimum shared tank: 30+ gallons

Yes, angelfish and mystery snails coexist well in 30 gallons or larger, with overlapping temperature and pH ranges that suit both species.

• Mystery snails grow to only 2-2.5 inches and have a hard shell that angelfish cannot open or eat.
• Both species thrive in temperatures between 76-82°F and alkaline water around pH 7.0-7.5.
• Mystery snails are bottom dwellers that spend most of their time grazing on glass and substrate, while angelfish patrol the middle level.
• Angelfish are cichlids that ignore slow-moving invertebrates with hard shells, as they prefer fish prey.
• Mystery snails add minimal bioload and help clean up leftover food on the bottom where angelfish do not reach.

Minimum shared tank: 30+ gallons

Yes, angelfish and nerite snails share a planted tank without issue, with solid temperature and pH overlap in a 30-gallon setup.

• Nerite snails reach only 1 inch and have a hard striped shell that angelfish cannot penetrate or view as prey.
• Temperature overlap sits at 76-80°F, which matches angelfish preferences and keeps nerites active without stress.
• Nerite snails require alkaline water between pH 7.0-7.5, which aligns with angelfish comfort levels in most community tanks.
• Nerites are dedicated algae grazers on the bottom level, completely separate from the middle-water column angelfish use.
• Nerites cannot reproduce in freshwater, so there is no risk of a population explosion even if females lay eggs on surfaces.

Minimum shared tank: 30+ gallons

No, ghost shrimp are large enough and visible enough to register as prey to a betta, which will eat them.

• Ghost shrimp grow to 2 inches, making them a substantial meal for a betta that eats insects and small crustaceans.
• Ghost shrimp are translucent but not invisible. A betta learns quickly that these large critters moving across the substrate are food.
• Cherry shrimp are smaller and more likely to hide in dense plants, but ghost shrimp are bolder and more exposed.
• Betta tank setups usually lack the dense plant cover that shrimp need to feel safe from a hunting betta.

Minimum shared tank: 5+ gallons

Yes, betta fish and mystery snails are a strong match in tanks of 5 gallons or larger, sharing temperatures of 76-82F and a pH of 7.0-7.5.

• Betta fish are carnivorous and ignore slow-moving invertebrates with hard shells, as mystery snails do not register as prey.
• Mystery snails are large enough that bettas do not view them as food, and the snail's shell provides protection from any curious nipping.
• Both species thrive in the same temperature range of 76-82F, which is warm enough for bettas without overheating the snail.
• A pH of 7.0-7.5 supports shell health in mystery snails while staying within the betta's preferred range.
• A 5-gallon tank provides enough space for both species without crowding.

Minimum shared tank: 5+ gallons

Yes, bettas and nerite snails coexist in 5 gallons or larger without issue, and nerites handle algae control without bothering the betta.

• Nerite snails are completely non-threatening to bettas. They move slowly, have a hard shell, and never compete for the betta's space.
• Nerite snails cannot reproduce in freshwater, so you will never have an accidental population explosion.
• Both species tolerate the same 76-80°F temperature range comfortably.
• Nerites prefer pH of 7.0-7.5, which sits in the middle of betta's acceptable range of 6.5-7.5.
• The 5-gallon minimum tank size covers a single betta and one nerite without bioload concerns.

Minimum shared tank: 5+ gallons

Yes, blue emperor tetras and cherry shrimp coexist peacefully in 20 gallons or larger, with tetras schooling mid-level while shrimp graze on algae and biofilm.

• Blue emperor tetras are 1.5-2 inches and are peaceful mid-water schooling fish that have no interest in hunting or eating shrimp.
• Cherry shrimp are 1-1.5 inches and spend nearly all their time grazing on algae, biofilm, and organic debris on tank surfaces.
• Blue emperor tetras are too small to swallow an adult cherry shrimp, and they are not aggressive toward invertebrates.
• Both species prefer similar temperatures of 73-80 degrees Fahrenheit and pH of 6.5-7.5.
• A planted 20-gallon tank provides plenty of surface area for shrimp to graze while giving tetras open swimming space in the middle.

Minimum shared tank: 20+ gallons

Yes, Blue Emperor Tetras and Ghost Shrimp do well together because both species are peaceful and share compatible water parameters in a community planted tank.

• Blue Emperor Tetras grow to 1.5-2 inches and are too small to view Ghost Shrimp as food, even when the shrimp is molting.
• Ghost Shrimp spend most of their time foraging along the bottom and among plants, while Blue Emperor Tetras school in the mid-water column.
• Both species thrive in the temperature range of 73-80F and pH of 7.0-7.5 without stress.
• Blue Emperor Tetras are schooling fish and feel safer in groups of 6 or more, which keeps them focused on their own school rather than tankmates.

Minimum shared tank: 20+ gallons

Yes, bristlenose plecos and mystery snails share a 20-gallon tank without issue, and both species help keep the tank clean.

• Bristlenose plecos grow to 4-6 inches while mystery snails reach 2-2.5 inches, but neither species threatens the other.
• Temperature overlap runs from 73-81°F, covering the upper range bristlenose plecos prefer and the full range mystery snails tolerate.
• Both species prefer alkaline water around pH 7.0-7.5, which keeps mystery snail shells healthy and suits bristlenose plecos.
• Bristlenose plecos are nocturnal grazers on surfaces and driftwood, while mystery snails are active throughout the day on glass and substrate.
• Neither species is territorial toward the other. They occupy the same bottom level but do not compete for food sources.

Minimum shared tank: 20+ gallons

Yes, bristlenose plecos and nerite snails coexist well in 20 gallons or larger, with both species preferring the same water temperatures.

• Both species thrive at 73-80 degrees Fahrenheit, giving them a 7-degree overlap that keeps both comfortable.
• Bristlenose plecos stay at 4-6 inches while nerite snails reach only 1 inch, so they occupy completely different size classes with no predator-prey relationship.
• Both are slow-moving bottom dwellers that do not compete for the same food sources. Plecos eat algae wafers and vegetables while nerites graze on biofilm and soft algae.
• Nerite snails have hard shells that provide complete protection from any curious pleco contact.
• The 20-gallon minimum tank size for bristlenose plecos provides more than enough space for a nerite snail or two.

Minimum shared tank: 20+ gallons

Yes, bronze corydoras and cherry shrimp coexist well in 20 gallons or larger with matching temperatures and pH ranges.

• Bronze corydoras stay at the bottom while cherry shrimp graze on surfaces, so they occupy different feeding zones.
• Corydoras are 2.5-3 inches and cherry shrimp are 1-1.5 inches, a size gap too wide for the cory to predate on shrimp.
• Both species thrive at 72-79°F and pH 6.5-8, giving them a wide comfortable overlap.
• Cherry shrimp add minimal bioload, so a 20-gallon tank provides plenty of room for a school of 6 cories and a shrimp colony.
• Cherry shrimp are fully aquatic invertebrates that breed in freshwater, so neither species needs special accommodations from the other.

Minimum shared tank: 20+ gallons

Yes, cardinal tetras and cherry shrimp coexist peacefully in 15 gallons or larger, with both species comfortable at 73-80°F.

• Cardinal tetras are 2-inch mid-level swimmers and cherry shrimp are 1-1.5-inch surface grazers, occupying completely different tank zones.
• Both species are small enough and calm enough that neither triggers defensive behavior in the other.
• Temperature overlap spans 73-80°F and pH overlap is 6.5-7, a range both species handle comfortably.
• Cherry shrimp breed readily and produce enough shrimplets that the school of tetras cannot meaningfully reduce the population.

Minimum shared tank: 15+ gallons

Cardinal tetras and mystery snails are peaceful tankmates that occupy different levels of the aquarium, and their environmental needs overlap enough for a successful pairing.

• Mystery snails are described as completely peaceful and unable to harm any tankmate, which eliminates the primary concern of aggression or predation against the tetras.
• The two species occupy different swimming levels, with tetras preferring the middle of the water column and mystery snails staying near the bottom and surfaces, meaning they do not compete for space or resources.
• Temperature ranges overlap well, with both species comfortable in the 73 to 81 degree Fahrenheit range, making shared tank conditions straightforward to achieve.

Minimum shared tank: 15+ gallons

Cardinal Tetras and Nerite Snails can coexist successfully with proper water chemistry management.

• Both species are peaceful with no predatory behavior, eliminating behavioral conflicts between them.
• Temperature ranges overlap sufficiently between 73-80F, allowing both species to thrive in the same tank.
• Both species have small body sizes (2 inches vs 1 inch) with no risk of predation or aggression toward each other.
• The primary consideration is pH, which requires careful management but does not prevent successful cohabitation.
• Neither species competes for food resources since Cardinals are omnivores feeding mid-water while Nerites are herbivorous bottom grazers.

Minimum shared tank: 15+ gallons

No, cherry shrimp and discus cannot share a tank. Discus require 82-88F, while cherry shrimp tolerate a maximum of 80F. The temperature mismatch alone rules out cohabitation.

• Discus thrive at 82-88F. Cherry shrimp stress above 80F. Extended exposure to discus temperatures leads to molting failures and death in shrimp.
• Cherry shrimp are freshwater invertebrates with narrow upper temperature limits. Even 81-82F sustained for weeks causes cumulative stress.
• Discus are slow-moving cichlids that browse surfaces. They would eat any shrimp that survived the temperature issue.
• pH overlap is narrow (6.5-7.0), but pH compatibility is irrelevant when temperature overlap is null.
• A 55-gallon minimum for discus gives plenty of space for shrimp, but space does not fix the thermal conflict.

Minimum shared tank: 55+ gallons

Cherry shrimp and goldfish should not be housed together because the goldfish will likely view the small shrimp as food.

• Goldfish are significantly larger than cherry shrimp, with fancy varieties reaching 4 to 6 inches and common varieties growing 6 to 12 inches, while cherry shrimp max out at 1 to 1.5 inches, making the size disparity a major predation risk.
• Goldfish are opportunistic omnivores that will eat almost anything that fits in their mouth, and cherry shrimp are small enough to be consumed as a food source rather than viewed as tankmates.
• The temperature ranges have only partial overlap, with goldfish preferring 60 to 72 degrees Fahrenheit and cherry shrimp thriving at 65 to 80 degrees Fahrenheit, creating suboptimal conditions for one or both species when kept at a compromise temperature.

Minimum shared tank: 30+ gallons

Yes, cherry shrimp and guppies coexist in 10 gallons or larger with overlapping temperatures of 72-80°F and pH of 7.0-7.8.

• Temperature overlap spans 72-80°F, covering both guppy's range and shrimp's range of 65-80°F.
• Cherry shrimp are bottom-dwelling algae grazers and guppies are top-level swimmers, so they rarely interact.
• A well-planted tank with java moss or java fern gives shrimp hiding spots from any curious guppy.
• Cherry shrimp are too small and too armored to register as prey to guppies.

Minimum shared tank: 10+ gallons

Mollys are incompatible with Cherry Shrimp because they are large enough to view the shrimp as prey and are listed on each other is incompatible lists.

• Molly is 4 to 5 inches long, which exceeds the 1 inch threshold that makes Cherry Shrimp easy prey.
• Molly is described as an opportunistic eater that will eat anything small enough to fit in its mouth, which includes 1.5 inch shrimp.
• Molly explicitly lists cherry-shrimp as incompatible in its own species data.
• Cherry Shrimp thrive in heavily planted tanks with moss for hiding, and while plants help, they cannot fully protect shrimp from a fish that actively hunts small prey.

Minimum shared tank: 20+ gallons

Yes, cherry shrimp and neon tetras coexist in 10 gallons or larger, with overlapping temperatures of 70-80°F and matching pH of 6.5-7.0.

• Neon tetras are mid-level swimmers and cherry shrimp are bottom dwellers, so they occupy separate tank zones and rarely interact.
• Temperature overlap of 70-80°F covers both species' ranges without stress.
• Cherry shrimp are too small and too armored to trigger neon tetra predation instincts.
• A well-planted tank with java moss or java fern gives shrimp plenty of cover for hiding between molts.

Minimum shared tank: 10+ gallons

No, oscars eat cherry shrimp. An adult oscar reaches 12-14 inches and has a wide mouth that can swallow adult shrimp in one bite.

• Oscars are large cichlids that grow to 12-14 inches. Their mouths are built to take bites out of tankmates. Cherry shrimp fit entirely inside the average oscar jaw.
• Oscars are predatory by nature. Even if they do not swallow every shrimp immediately, they will pick through the tank and eliminate the population over weeks.
• Cherry shrimp hide on surfaces, plants, and substrate. Oscars sift through all of these areas while rooting for food.
• Temperature overlap 74-80F covers both species, and pH 6.5-8 is wide, but parameter overlap does not resolve predation.
• Shrimp colonies in an oscar tank never establish. Any surviving shrimp stay hidden permanently and stop breeding.

Minimum shared tank: 75+ gallons

Yes, cherry shrimp and peacock gudgeons coexist peacefully in 15 gallons or larger, with shrimps grazing at the bottom and gudgeons perched higher on decorations.

• Cherry shrimp grow to only 1-1.5 inches and are bottom-dwelling grazers, while peacock gudgeons are 2.5-3 inches and hover near the middle and lower levels without actively hunting.
• Peacock gudgeons are not shrimp predators. They prefer small meaty foods and are too slow to catch active shrimp in open water.
• Cherry shrimp need groups of 10 or more to feel secure and breed readily in stable conditions with plenty of biofilm surfaces.
• Both species thrive in temperatures of 74-79 degrees Fahrenheit and pH of 6.5-7.5, making parameter matching straightforward.
• A well-planted 15-gallon tank with java moss, driftwood, and hiding spots supports both species without conflict.

Minimum shared tank: 15+ gallons

Pearl Gouramis are peaceful community fish that generally tolerate small shrimp, but individual temperament and tank conditions determine whether predation occurs.

• Pearl Gouramis are documented as genuinely peaceful fish for their size, and they are not listed as incompatible with shrimp on their official species list.
• The primary risk is the size differential: a 4.5-inch Pearl Gourami is three to four times larger than a 1.5-inch Cherry Shrimp, creating potential for accidental predation or ingestion of shrimplets.
• Unlike some gouramis known to hunt invertebrates, Pearl Gouramis are primarily surface and mid-water feeders, but they do occasionally explore lower swimming levels where shrimp graze.

Minimum shared tank: 30+ gallons

No, platies eat cherry shrimp. Adult shrimp have no reliable defense against a 2-3 inch fish that can pick them off one by one.

• Platy mouths are wide enough to pick off adult cherry shrimp. Neos lack the speed or armor to escape.
• Platies are omnivorous livebearers that browse surfaces and sift through substrate, naturally encountering shrimplets and small adults.
• Temperature overlap 70-80F covers both, but parameter overlap does not solve the predation problem.
• Shrimp in the same tank spend energy hiding and reduce activity, affecting the display and their health over time.
• Cherry shrimp need stable, predator-free environments to breed reliably. Platies eliminate any breeding population.

Minimum shared tank: 10+ gallons

Cherry Shrimp and Swordtails are not recommended to coexist because the size and predatory opportunity of Swordtails creates unacceptable risk for the shrimp.

• Cherry Shrimp are 1 to 1.5 inches and completely defenseless, while Swordtails grow to 5 to 6 inches and are listed as having semi-aggressive behavior in males toward each other, which extends to tankmates of similar or smaller size.
• Swordtails are omnivores by diet and will opportunistically eat smaller invertebrates that fit in their mouths. A 5-inch Swordtail can easily consume a 1.5-inch Cherry Shrimp, especially if the shrimp is caught while molting or during feeding frenzies.
• Cherry Shrimp occupy the bottom swimming level and Swordtails prefer the top level, but the tank is a shared environment and Swordtails will investigate and potentially consume shrimp that wander into the open.
• Neither species list includes the other in their compatibility data, which suggests a known risk rather than a neutral interaction. Cherry Shrimp are explicitly listed as incompatible with some community fish, and Swordtails are not on their safe list.

Minimum shared tank: 20+ gallons

Tiger Barbs are active fin-nippers that will stress, chase, and potentially kill Cherry Shrimp, making this pairing a conflict.

• Tiger Barb is listed explicitly on the Cherry Shrimp incompat list, which is a direct and deliberate warning from the species data itself.
• Tiger Barbs are described as the rowdy kids of the hobby, active and fast, spending most of their time chasing each other, which means they are likely to investigate and nip at small shrimp passing through the middle of the tank.
• Cherry Shrimp are tiny at 1 to 1.5 inches and completely defenseless. Their long antennae, delicate legs, and slow movement make them an easy target for an active, nippy fish three times their size.
• Even though Tiger Barb does not name Cherry Shrimp on its own incompat list, the general incompatibility pattern for Tiger Barbs includes small, slow, or long-finned tankmates, and Cherry Shrimp fit that profile precisely.

Minimum shared tank: 20+ gallons

Discus and Mystery Snails have incompatible temperature and pH requirements that cannot be safely reconciled in a home aquarium.

• Temperature ranges do not overlap adequately. Discus require 82-88F while Mystery Snails prefer 68-82F, leaving only the single degree at 82F where both species are technically present, which forces the snail to its upper tolerance limit.
• pH requirements are fundamentally opposed. Discus thrive in acidic water (5.5-7.0) while Mystery Snails require alkaline conditions (7.0-8.0), with only 7.0 as a theoretical meeting point that is suboptimal for both species.
• Neither species lists the other in their compatibility profiles, which suggests cautious positioning from aquarists who have attempted this combination.

Minimum shared tank: 55+ gallons

No, discus need 82-88F while nerite snails require 72-80F, creating an irreconcilable temperature conflict.

• Discus require water temperatures of 82-88F for long-term health and proper immune function.
• Nerite snails thrive at 72-80F and suffer shell degradation and shortened lifespan when kept above 80F consistently.
• There is no overlap between these ranges, making a shared tank impossible for both species.
• Nerite snails also prefer harder water while discus need soft to medium water parameters, compounding the incompatibility.
• Even a brief overlap in the low end of discus temp and high end of nerite temp does not provide enough stability for either species.

Minimum shared tank: 55+ gallons

Temperature and pH parameter mismatches create unsuitable long-term cohabitation conditions despite compatible temperaments.

• The temperature ranges overlap only partially. German Blue Rams prefer 80-86 degrees Fahrenheit while Mystery Snails prefer 68-82 degrees Fahrenheit, with overlap only at 80-82 degrees. Keeping the tank at the upper end of the ram range would stress the snail.
• The pH ranges do not align well. Rams prefer acidic to neutral water at 5.5-7.0 pH while Mystery Snails prefer neutral to alkaline water at 7.0-8.0 pH. The only overlap is at exactly 7.0 pH, which is difficult to maintain and suboptimal for both species.
• Behaviorally the pairing is unproblematic. Rams are peaceful dwarf cichlids that chase away perceived threats but mystery snails pose no threat and should not trigger territorial aggression. Neither species appears on the other is incompat list for behavioral reasons.

Minimum shared tank: 20+ gallons

These species have enough environmental and behavioral overlap to coexist, though ideal conditions for both require careful balancing of pH and temperature.

• The Nerite Snail is explicitly listed as compatible with species that the German Blue Ram also tolerates, including neon-tetra and bronze-corydoras, suggesting no inherent behavioral conflict between these two categories of tankmates.
• Temperature ranges overlap at 80 degrees Fahrenheit, which is at the upper end of the Nerite snail comfort zone and within the middle of the Ram preference, providing a workable compromise point for both species.
• The Nerite snail is a slow-moving herbivore that offers no competition for food resources with an omnivorous cichlid, and its small size and hard shell make it an unappealing target even for a territorial Ram pair.

Minimum shared tank: 20+ gallons

Yes, Ghost Shrimp and Peacock Gudgeons do well together because both thrive in planted tanks with matching temperature and pH requirements.

• Peacock Gudgeons grow to 2-3 inches and are peaceful by nature, showing no interest in hunting or eating shrimp.
• Ghost Shrimp are transparent scavengers that blend into the tank decor and go largely unnoticed by the gudgeon.
• The temperature overlap of 74-79F suits both species without requiring compromise on heater settings.
• Both species prefer slightly alkaline water in the 7.0-7.5 pH range, which is typical for community tanks.

Minimum shared tank: 15+ gallons

Goldfish are documented snail predators and will likely attack and consume Mystery Snails despite their peaceful reputation.

• Goldfish are explicitly listed as known predators that will eat snails and shrimp in their species description.
• Mystery Snails are small at only 2-2.5 inches while Goldfish grow to 6-12 inches, making the snail an easy target.
• The Mystery Snail shell is described as only moderately hard, offering limited protection against Goldfish pecking behavior.
• While temperature ranges overlap (68-72F), this thermal compatibility becomes irrelevant if the snail is at risk of being eaten.

Minimum shared tank: 30+ gallons

Goldfish and Nerite Snails have conflicting temperature requirements and the goldfish may injure the small snail.

• Temperature overlap is minimal at only 72F, which represents the upper limit for goldfish comfort and the lower limit for nerite snail health. This creates an uncomfortable middle ground for both species.
• Goldfish are opportunistic omnivores that may bite at or attempt to eat small snails. Even if the snail survives initially, repeated nipping can cause stress and shell damage.
• Nerite snails are delicate invertebrates with soft bodies exposed beyond their shell. Goldfish are large and curious, posing a physical threat even if not intentionally predatory.
• Both species have compatible pH ranges (7.0-8.5), so water chemistry is not the limiting factor here.

Minimum shared tank: 30+ gallons

Yes, kribensis and mystery snails coexist well in a 20-gallon tank, with both species preferring similar water conditions and ignoring each other.

• Mystery snails grow to 2.5 inches and have a hard shell that kribensis at 4 inches cannot break or eat.
• Temperature overlap spans 75-82F, with kribensis preferring 78F and mystery snails preferring 76F.
• pH ranges overlap from 7.0-7.5, which suits both species comfortably.
• Kribensis are bottom-dwelling cichlids that focus on their cave territory while mystery snails cruise the glass and surfaces for algae.
• Kribensis do not attempt to eat mystery snails because the shell is too hard and the snail is too large to swallow.

Minimum shared tank: 20+ gallons

Yes, kribensis and nerite snails coexist well in a 20-gallon tank, with both species preferring similar alkaline water conditions.

• Nerite snails grow to 1 inch and have a hard shell that kribensis at 4 inches cannot break or eat.
• Temperature overlap spans 75-80F, with kribensis preferring 78F and nerite snails preferring 76F.
• pH ranges overlap from 7.0-7.5, which suits both species comfortably and supports nerite shell health.
• Kribensis are bottom-dwelling cichlids that focus on their cave territory while nerite snails graze on glass and surfaces.
• Kribensis ignore nerite snails because the hard shell and slow movement do not trigger prey drive.

Minimum shared tank: 20+ gallons

Yes, kuhli loaches and mystery snails coexist peacefully in 15 gallons or larger with matching water parameters.

• Kuhli loaches grow to 3-5 inches and stay on the substrate. Mystery snails crawl on surfaces and rarely venture below the substrate line.
• Both tolerate 73-82F and pH 7 exactly.
• Kuhli loaches are nocturnal burrowers. Mystery snails are slow diurnal grazers. Their active hours barely overlap.
• Neither species has the anatomy or behavior to attack the other.

Minimum shared tank: 15+ gallons

Yes, kuhli loaches and nerite snails share a tank well in 15 gallons or larger with identical pH requirements.

• Kuhli loaches reach 3-5 inches and are bottom-dwelling omnivores. Nerite snails stay at 1-2 inches and graze on surfaces.
• Both species tolerate 73-80F and pH 7.
• Nerite snail shells are hard enough that even curious loaches cannot damage them.
• Kuhli loaches are nocturnal. Nerite snails are active during the day. They occupy the same space but not the same time.

Minimum shared tank: 15+ gallons

Molly and Mystery Snail are compatible tankmates that share overlapping water parameters and non-overlapping lifestyles.

• Molly and Mystery Snail share compatible temperature ranges (72-82F) and pH ranges (7.0-8.0), meaning neither species will be stressed by suboptimal water conditions.
• Molly swimming level is top while Mystery Snail swimming level is bottom, which means they occupy different vertical spaces in the tank and rarely interact directly.
• Molly is an omnivore that does not naturally prey on mystery snails. Mystery Snail is too large (2-2.5 inches) and too well-shelled to be an attractive target for mollies, and no predatory behavior toward snails is noted in the Molly data.
• Neither species lists the other in their incompat list. The Mystery Snail incompat list includes only oscar, and the Molly incompat list focuses on species that are small, colorful, or have specific conflicts (betta, neon-tetra, cardinal-tetra, endlers) or incompatible animals (axolotl).

Minimum shared tank: 20+ gallons

Mollies and Nerite Snails are excellent tankmates with no overlapping conflicts in behavior, diet, or water requirements.

• Water parameters align closely: both species thrive in 72-80F temperature ranges and pH 7.0-8.5, eliminating environmental stress as a concern.
• Behavioral profiles show no conflict: Mollies are top-dwelling omnivores while Nerites are bottom-dwelling herbivores, meaning they occupy separate zones and have entirely different dietary needs.
• Nerite Snails are completely harmless invertebrates that pose zero risk to fish, and their small size combined with hard shells makes them uninteresting as prey targets for Mollies.
• Mollies show no documented aggression toward invertebrates, and the Nerite compatibility list includes multiple fish species that overlap with the Molly compatibility list, suggesting shared community compatibility.
• Neither species appears on the other species incompat list, which is a strong positive indicator for compatibility.

Minimum shared tank: 20+ gallons

Yes, mystery snails and nerite snails coexist peacefully in just 5 gallons, and both are excellent cleanup crew additions for planted tanks.

• Both species tolerate temperatures between 72-80 degrees Fahrenheit, giving them an 8-degree shared range.
• Mystery snails reach 2-2.5 inches while nerites stay at 1 inch, so size difference is not an issue and neither is large enough to prey on the other.
• Both prefer alkaline water (pH 7.0-8.0) and need calcium for healthy shell growth, so their mineral requirements align completely.
• Mystery snails are active during the day and will cruise the tank surface while nerites work the glass and hardscape, so they do not compete for grazing territory.
• Neither species shows any aggression toward the other. Snails of different species simply ignore each other in typical setups.

Minimum shared tank: 5+ gallons

No, oscars are large predatory cichlids that treat mystery snails as food, crushing shells and consuming the contents.

• Oscars are opportunistic predators that eat anything that fits in their mouths or can be broken down.
• Mystery snails grow to 2 inches with a soft body inside a thin shell that an oscar can crack with its jaws.
• Oscar tanks have powerful filtration and heavy feeding schedules, but curiosity and prey drive still lead to snail predation.
• Once an oscar learns that snails are edible, it actively hunts them rather than ignoring the tankmates.
• Mystery snails rely on open substrate and plant surfaces, areas an oscar controls aggressively during feeding.

Minimum shared tank: 75+ gallons

Yes, mystery snails and otocincluses coexist well in 10 gallons or larger because both thrive in 72-79F water with matching pH needs.

• Mystery snails stay on tank surfaces and substrate, while otocincluses graze on algae on glass and hardscape.
• Both species tolerate 72-79F and pH 7-7.5 without stress.
• Otocincluses grow to 2 inches; mystery snails reach 2-3 inches. Neither one crowds the other.
• Neither species shows aggression toward the other. Snails move slowly and otocincluses are skittish but peaceful.

Minimum shared tank: 10+ gallons

Mystery Snails and Platies share overlapping water parameters, occupy different tank zones, and have no behavioral conflicts, making them ideal tankmates.

• Both species thrive in overlapping temperature ranges (70-80F) and pH ranges (7.0-8.0), ensuring stable water conditions that suit both.
• Mystery Snails are bottom-dwelling grazers while Platies occupy the top swimming level, creating complementary zone usage that minimizes competition for space and resources.
• Neither species displays any aggression. Mystery Snails are confirmed to be completely harmless, and Platies are listed as peaceful community residents with no predatory tendencies toward invertebrates.
• Platy compatibility lists include similar bottom-dwelling species like bronze-corydoras, supporting the likelihood of invertebrate co-habitation success.

Minimum shared tank: 10+ gallons

Mystery snails and rummy nose tetras are compatible tankmates that occupy different areas of the aquarium with no overlap in aggression or territorial behavior.

• Neither species appears on the other's incompatibility list, and both share compatibility with species like neon tetras and bronze corydoras, suggesting established cohousing success in community tanks.
• Mystery snails are completely peaceful bottom dwellers that cannot harm rummy nose tetras, which are mid-level schooling fish, meaning there is no risk of predation or aggression from the snail side.
• The temperature overlap of 75 to 82 degrees Fahrenheit accommodates both species comfortably, and while the pH preference slightly differs, many aquarists successfully maintain both in neutral to slightly alkaline water around 7.0 to 7.2.

Minimum shared tank: 20+ gallons

Mystery snails and swordtails share overlapping water parameters and occupy different vertical zones, making them compatible tankmates.

• Water parameters align well: temperature overlap is 72-82F and pH overlap is 7.0-8.0, creating no stress for either species.
• Mystery snails are bottom-dwelling herbivores while swordtails are top-swimming omnivores, so they occupy different levels of the aquarium and do not compete for food.
• Mystery snails are completely harmless invertebrates that cannot harm swordtails, and there is nothing in either species profile indicating aggression toward the other. Swordtails target other male swordtails or similar-looking fish, not slow-moving bottom snails.

Minimum shared tank: 20+ gallons

Tiger barbs will very likely harass and nip the exposed soft tissue of mystery snails, making this pairing unsafe.

• Tiger barbs are documented fin nippers with a specific tendency to target slow-moving creatures like snails and their exposed body parts.
• Mystery snails have soft, vulnerable anatomy including antennae, siphon, and foot that are easily accessible targets when the snail is moving.
• The barb is larger than the snail at 3 inches and operates as an aggressive schooling fish, which amplifies the harassment risk.
• Water parameters overlap well enough for cohabitation but behavioral incompatibility overrides water chemistry compatibility.

Minimum shared tank: 20+ gallons

No, oscars are large predatory cichlids that eat nerite snails, cracking shells and consuming the soft body inside.

• Oscars are opportunistic predators that eat anything small enough to fit in their mouth or can be crushed.
• Nerite snails grow to 1-2 inches with a hard shell, but an oscar's powerful jaws can crack the shell with ease.
• Oscars have a strong prey drive that triggers when they see slow-moving invertebrates like snails.
• Nerite snails have no means of escape from a 12-inch oscar in a standard tank setup.
• Once an oscar learns that nerite snails are edible, it will actively hunt and consume every snail in the tank.

Minimum shared tank: 75+ gallons

Yes, nerite snails and otocincluses share a tank well in 10 gallons or larger because both prefer the same cool-to-warm range.

• Nerite snails consume algae on surfaces, rocks, and driftwood. Otocincluses clean glass and plant leaves.
• Both tolerate 72-79F and pH 7-7.5 without visible stress.
• Nerite snails grow to 1-2 inches. Otocincluses reach 2 inches. Body sizes stay well below what triggers competition.
• Nerite snails have hard spiraled shells. Otocincluses show zero interest in attacking shelled tankmates.

Minimum shared tank: 10+ gallons

Nerite snail and Platy are compatible tankmates.

• Temperature ranges overlap completely (72-80F) and pH ranges overlap fully (7.0-8.2), matching the snail's tolerance.
• Both species are peaceful and have no known predatory behavior toward each other.
• Nerite snail is a herbivore that grazes on algae, while Platy is an omnivore that will not target the snail.
• Hard water preference benefits both, supporting shell health for the snail and livebearer reproduction for the Platy.

Minimum shared tank: 10+ gallons

Yes, nerite snails and pygmy corydoras coexist peacefully in 10 gallons or larger, with overlapping temperature and pH ranges that suit both species.

• Nerite snails reach 1 inch and spend their time on surfaces, scraping algae.
• Pygmy corydoras grow to 1 inch and hover mid-water in schools.
• Temperature overlap of 72-79F suits both species, with 75F being ideal for corydoras and 76F ideal for nerites.
• The pH overlap of 7-7.4 suits nerites without threatening pygmy corydoras.
• Nerites ignore fish completely and pygmy corydoras pay no attention to snails.

Minimum shared tank: 10+ gallons

The two species can coexist only if water is kept at a narrow pH around 7.0 with moderate hardness, otherwise the Nerite snail is at risk of shell erosion.

• Temperature overlap (75-80F) supports both species without stress.
• pH overlap is minimal (only at 7.0) and the Nerite snail requires harder, more alkaline water while Rummy Nose Tetra thrives in softer, acidic conditions.
• Both species are peaceful and have similar temperament, so behavioral compatibility is not an issue.
• The primary concern is the risk of shell erosion for the Nerite snail if water remains consistently soft and acidic.

Minimum shared tank: 20+ gallons

Both species share matching water parameters and complementary temperaments, making them well-suited tankmates with no meaningful conflict risk.

• Hard water overlap is complete, satisfying the mineral needs of both species without compromise.
• Temperature range overlap spans 72-80 degrees F, covering most of the Nerite snail preference and the lower end of Swordtail preference.
• Swordtails are peaceful toward other species and are not known to display snail-hunting or snail-bullying behavior.
• Nerite snails have a hard, thick shell that provides strong protection against any incidental contact from a fish of this size.

Minimum shared tank: 20+ gallons

Tiger Barbs will reliably nip the exposed antennae and foot of Nerite Snails causing stress and potential injury.

• Tiger Barbs are documented fin-nippers and will target slow-moving creatures with exposed soft tissue.
• Nerite Snails have antennae and foot that extend outside the hard shell, making them vulnerable targets.
• The pH ranges overlap only partially, with the Tiger Barb preference being at the low end of the Nerite snail preference.
• Tank size and hiding places for the snail are not specified but would be significant factors if attempting this pairing.

Minimum shared tank: 20+ gallons

No, African dwarf frogs have poor eyesight and slow movement that triggers a betta to attack and eat their food.

• African dwarf frogs are slow swimmers with poor vision. They cannot dodge a territorial betta.
• ADFs eat at the bottom and near the substrate. Bettas notice slow-moving creatures at feeding time and may bite them.
• Bettas may eat the food placed for the frogs, leaving ADFs underfed while the betta gets bloated.
• ADFs need to surface to breathe air. A betta stationed near the surface will attack frogs coming up for air.

Minimum shared tank: 10+ gallons

Yes, albino plecos and bettas share a tank well in 30 gallons or larger, with full temperature overlap at 76-82°F.

• Albino plecos max out around 5 inches and are completely non-threatening to bettas, staying on the bottom where bettas do not patrol.
• Temperature overlap is perfect at 76-82°F, which is right in betta's sweet spot.
• Albino plecos are nocturnal and spend daylight hours hidden in caves, giving bettas uninterrupted top-level territory.
• The 30-gallon minimum easily handles the combined bioload of one albino pleco and one betta.

Minimum shared tank: 30+ gallons

No, american flagfish are aggressive fin-nippers and prefer cool water that bettas cannot survive in.

• American flagfish grow to 2.5 inches and are known fin-nippers that will target long-finned fish like bettas.
• They prefer water temperatures of 64-72F, which is far below the betta minimum of 76F.
• Male flagfish display bright red coloration during breeding season that triggers betta aggression.
• Flagfish are not community fish and will defend territory aggressively against slow-moving tankmates.

Minimum shared tank: 10+ gallons

No, both angelfish and bettas claim the mid-to-top water column and their size difference creates a dangerous power imbalance.

• Angelfish grow to 6 inches long and 8 inches tall, while bettas reach 2.5-3 inches. A mature angel can seriously injure or kill a betta if it decides to attack.
• Both species are cichlids (bettas are labyrinth breathers with strong territorial behavior) that claim the mid-to-top water column, creating direct competition for prime swimming space.
• Angelfish are slow-growing but become aggressive as they approach maturity, and a betta that survived juvenile angelfish may become prey once the angel reaches 5+ inches.
• Betta tanks are typically 5-10 gallons, which is grossly inadequate for angelfish that need 30+ gallons minimum. The tank size alone makes this pairing impractical and cruel.

Minimum shared tank: 30+ gallons

No, arowanas are 24-36 inch apex predators that will eat bettas the moment they surface to breathe air.

• Arowanas reach 24-36 inches and need a 250-gallon minimum tank as adults.
• They are surface-hunting apex predators with a documented appetite for fish that fit in their mouths.
• Bettas are surface breathers that spend time at the exact level an arowana hunts.
• A betta is exactly the right size and behavior type to trigger an arowana feeding response.

Minimum shared tank: 250+ gallons

No, axolotls need 60-68F water while bettas need 76-82F, and axolotls may bite a betta during feeding.

• Axolotls require 60-68F. Bettas need 76-82F. There is no temperature range where both species thrive.
• Axolotls are coldwater amphibians. Above 74F they experience stress and become susceptible to fungal infections.
• Bettas are tropical and slow down significantly below 76F. Below their ideal range they are lethargic, stop eating, and get sick.
• Axolotls may bite at a betta during feeding, and a betta's flowing fins look like prey to an axolotl's hunting behavior.

Minimum shared tank: 20+ gallons

No, black skirt tetras are known fin nippers and will damage a betta's flowing fins in a matter of days.

• Black skirt tetras grow to 2.5 inches and are active swimmers that naturally nip at long-finned tankmates.
• Black skirt tetras kept in schools of 6 or more become bolder and more coordinated in their nipping behavior.
• A betta's long fins are an easy target and the tetras will repeatedly attack the trailing edges.
• Once fins are damaged, the betta becomes vulnerable to secondary bacterial infections.

Minimum shared tank: 20+ gallons

No, blue emperor tetras have iridescent blue coloring that bettas often mistake for rival bettas, triggering aggression.

• Blue emperor tetras display a distinctive blue and iridescent sheen that closely resembles a rival betta's coloring.
• Bettas are hardwired to attack anything that looks like another betta, especially fish with blue or iridescent coloring.
• Blue emperor tetras grow to 1.5-2 inches and school in the mid-level, making them a constant visual trigger for the betta.
• The betta will either chase and attack the blue emperors or become hyper-aggressive defending its territory against them.

Minimum shared tank: 20+ gallons

No, bettas eat blue velvet shrimp that are smaller than 1 inch, treating them as live prey.

• Blue velvet shrimp grow to 1-1.5 inches, well within prey size for most bettas.
• Bettas with strong prey drive will actively hunt shrimp across the tank.
• Shrimp are slow-moving and cannot escape a determined betta.
• Even shrimp that survive initial introduction often get eaten over time.

Minimum shared tank: 5+ gallons

No, Boesemani rainbowfish grow to 4-5 inches and are active fast swimmers that outcompete bettas and stress them.

• Boesemani rainbowfish reach 4-5 inches and need at least 30 gallons with open swimming space for a school of 6.
• Rainbowfish are schooling fish that swim constantly in the mid-column. A betta sees this as encroachment on its territory.
• Bettas are slow-moving top-level swimmers. Rainbowfish outpace them and can nip at betta fins during feeding.
• Rainbowfish are active during the day and rest at night. Bettas are more sessile. The behavioral mismatch causes constant stress.

Minimum shared tank: 30+ gallons

No, Bolivian rams are too large and territorial for a betta tank, and a ram needs 30 gallons minimum while bettas thrive in 5-10 gallons.

• Bolivian rams grow to 3-3.5 inches while bettas top out around 2.5-3 inches, so size overlap exists but the ram's cichlid personality does not.
• Bolivian rams are dwarf cichlids that claim territory at the bottom of the tank and defend it with real aggression during spawning.
• The minimum tank for a Bolivian ram is 30 gallons, which is a completely different setup than what a betta needs.
• Bettas are top-dwellers that establish surface territory, and a bottom-territorial cichlid in a small space creates constant stress for both fish.

Minimum shared tank: 30+ gallons

Yes, bettas and bristlenose plecos share a tank well in 20 gallons or larger, with overlapping temperatures of 76-81°F.

• Bettas are top-dwelling territorial fish, and bristlenose plecos are bottom-dwelling grazers, so they occupy completely different tank zones.
• Temperature overlap sits at 76-81°F, which falls within betta's ideal range of 76-82°F.
• Bristlenose plecos grow to only 4-6 inches and pose zero predatory threat to a betta.
• Both species tolerate the same pH range of 6.5-7.5 without stress.

Minimum shared tank: 20+ gallons

No, buenos aires tetras are aggressive fin nippers and too active for bettas, and they grow too large for most betta tanks.

• Buenos Aires tetras reach 2.5-3 inches and need a minimum of 30 gallons due to their speed and activity level.
• This species is a documented fin nipper, targeting long-finned fish including bettas, guppies, and angelfish.
• Buenos Aires tetras are schooling fish that need groups of 6 or more, which creates constant activity in the mid-level.
• The betta will either be nipped relentlessly or will be chased into a corner by the school, with no safe space.

Minimum shared tank: 30+ gallons

No, bumblebee gobies need brackish water at 1.005-1.010 specific gravity, while bettas require pure freshwater.

• Bumblebee gobies are stenohaline and need brackish water with specific gravity of 1.005-1.010 to survive long-term.
• Bettas are strictly freshwater fish and will suffer in brackish conditions.
• No single tank setup satisfies both species' salinity requirements.
• Bumblebee gobies are also aggressive toward each other and may nip at slow-moving bettas.

Minimum shared tank: 10+ gallons

No, cardinal tetras are small schooling fish that need soft acidic water, conditions that conflict with standard betta setups.

• Cardinal tetras stay at 2 inches and fit easily in a betta's mouth if the betta decides to hunt them, especially at night when tetras rest near the substrate.
• Cardinal tetras need soft, acidic water (pH 5.0-7.0) while bettas prefer slightly higher pH (6.5-7.5). Finding a sweet spot that benefits both is difficult without compromising one species.
• Cardinal tetras are schooling fish that need groups of 8+ in a 20+ gallon tank, which conflicts with the smaller, single-species betta setups most people run.
• A betta in a planted 20-gallon might tolerate cardinal tetras initially, but aggression increases as the betta matures and claims its territory, typically within 2-3 months.

Minimum shared tank: 15+ gallons

No, celestial pearl danios have bright colors and patterning that a betta reads as competition, leading to attacks.

• Male celestial pearl danios have bright orange bodies with pearl-like spots, colors a betta reads as rival males.
• Bettas are top-level swimmers and celestial pearls also occupy mid to upper water, so encounters are direct.
• Danios are schooling fish that dart around. A betta interprets this activity as encroachment on its territory.
• A stressed danio loses its coloration quickly and becomes more vulnerable to predation.

Minimum shared tank: 10+ gallons

No, bettas and chilli rasboras occupy overlapping swim zones and bettas may eat the tiny rasboras as live prey.

• Chilli rasboras reach only 0.7 inches, small enough for a betta to swallow as prey.
• Both species prefer the middle and upper levels of the tank, increasing territorial overlap.
• Betta prey drive varies by individual; some bettas will hunt the rasboras within days of introduction.
• Chilli rasboras require a school of 8-12, which creates a visible group that bettas often treat as prey targets.

Minimum shared tank: 5+ gallons

No, both bettas and clown killifish are surface-dwelling carnivores that compete for territory at the top of the tank, and the outcome is bad either way.

• Bettas are top-dwellers that claim the surface as their territory and will attack anything that trespasses, including clown killifish.
• Clown killifish hover at the surface in the top inch of water, which places them directly in a betta's defended zone.
• Clown killifish reach only 1.2-1.4 inches, so even a non-aggressive betta can injure them with a single charge.
• Killifish may nip at a betta's long fins out of stress or perceived competition, and the betta may attack killifish that encroach on surface territory.

Minimum shared tank: 5+ gallons

No, clown loaches grow to 12 inches, need groups of 5-6, and require 100 gallons minimum, making them incompatible with bettas.

• Clown loaches reach 12 inches fully grown and need 100 gallons to healthily house a group of 5-6.
• Clown loaches are active swimmers that cruise the tank all day, constantly stressing a betta that prefers still water.
• Loaches may nip betta fins as they explore the middle water column where a betta swims.
• Bettas and clown loaches have overlapping water parameters on paper but the tank size mismatch is behavioral.

Minimum shared tank: 75+ gallons

No, columbian tetras are schooling fish that compete for mid-level space with bettas, and bettas will attack them as intruders.

• Columbian tetras reach 2 inches and school in the mid-level, directly overlapping with a betta's territory.
• Bettas are solitary and territorial, viewing any school of fish in their zone as a threat to be driven out.
• Columbian tetras kept in groups of 6 or more present a persistent visual presence that aggravates the betta.
• The stress of constant chasing causes columbian tetras to lose color, stop schooling, and eventually decline in health.

Minimum shared tank: 20+ gallons

No, common plecos grow 12-18 inches, need 75+ gallons, and may suck a betta's slime coat at night while resting.

• Common plecos grow 12-18 inches and need 75-125 gallons minimum. Most betta tanks are under 20 gallons.
• Common plecos are primarily nocturnal and become active at night when bettas are resting on the bottom or near decorations.
• Common plecos use their sucker mouths to attach to surfaces and can damage betta slime coats while feeding.
• They produce enormous bioload that overwhelms the filtration in typical betta setups.
• Large plecos will move decorations and rearrange tanks, destroying betta territory and hiding spots.

Minimum shared tank: 75+ gallons

No, congo tetras stress bettas with constant movement and require a larger group than a betta tank can accommodate.

• Congo tetras grow to 3-4 inches and are active swimmers that dart across all tank levels.
• They need groups of 6 or more to feel secure, which means constant activity a betta interprets as threats.
• A 40-gallon minimum for a proper congo tetra school exceeds what most betta keepers set up.
• Bettas hold territory and react to fast-moving fish as if they are rivals or predators.

Minimum shared tank: 30+ gallons

No, convict cichlids are aggressive bottom-dwelling cichlids that grow 4-5 inches and will kill a betta during breeding.

• Convict cichlids grow 4-5 inches and are aggressive Central American cichlids that claim the entire tank when breeding.
• Bettas prefer the upper water column and will be chased relentlessly by territorial convict pairs.
• When convicts spawn, they attack anything within range including fish larger than themselves.
• Convicts are bottom-dwellers that dig substrate and rearrange tanks, stressing bettas.
• Both species need similar water parameters, which makes the mismatch in size and aggression harder to spot.

Minimum shared tank: 30+ gallons

No, denison barbs need cool water around 68-77F and fast-flowing currents that bettas cannot tolerate.

• Denison barbs reach 4-6 inches and need a 55-gallon minimum as active schooling fish.
• They require water temperatures on the cooler end of the betta range and do best with moderate to strong current.
• Bettas are labyrinth fish adapted to still or slow-moving water and develop health problems in strong currents.
• A school of denison barbs occupies the middle tank level, directly crossing paths with a betta's territory.

Minimum shared tank: 30+ gallons

No, bettas and discus cannot be kept together because the temperature overlap is just 82 degrees and discus are too sensitive for the risk.

• Discus require water at 82-88 degrees, and bettas tolerate 76-82 degrees, meaning the only overlap point is 82 degrees, leaving no margin for error.
• Betta fins are slow-moving targets that discus may sample or attack, and discus are too expensive and sensitive to risk losing to betta aggression.
• Discus are slow, round-bodied fish that cannot escape a territorial betta in an aquarium.
• Discus are highly sensitive to stress and disease, and the presence of an aggressive betta in their tank compromises their immune system.

Minimum shared tank: 55+ gallons

No, dojo loaches grow 6-8 inches, need cool water (50-77F), and are active bottom dwellers that will bump and stress bettas.

• Dojo loaches need 50-77F water, with 60-68F being ideal. Betta temperatures of 76-82F are at the upper limit for dojos.
• Dojo loaches grow 6-8 inches and need 40+ gallons, with 75 gallons being ideal for their long-term health.
• Dojo loaches are active bottom-dwellers that burrow and explore constantly, disturbing bettas resting near the substrate.
• They are peaceful but large enough to knock bettas around during their foraging behavior.
• Dojo loaches are social but not schooling fish, and they prefer cooler temperatures that stress bettas.

Minimum shared tank: 40+ gallons

No, both bettas and dwarf gouramis are labyrinth breathers that claim the same surface territory, causing direct conflict.

• Both species breathe air at the surface and claim the top water column as their territory. Two labyrinth fish in the same tank means two fish competing for the exact same resource.
• Dwarf gouramis grow to 3.5 inches and are active swimmers, which puts them in direct conflict with bettas that see any fish in their zone as either a rival or a threat.
• Dwarf gouramis carry a high risk of Dwarf Gourami Iridovirus (DGIV), and the stress of cohabiting with a betta weakens their immune system, making viral outbreak more likely.
• Male dwarf gouramis are semi-aggressive toward each other and toward similarly shaped fish, and a betta's flowing fins trigger the same aggressive response in a gourami that they would trigger in another betta.

Minimum shared tank: 10+ gallons

No, emperor tetras are peaceful schooling fish that compete for mid-level space with bettas, and bettas will attack them as intruders.

• Emperor tetras reach 2 inches and school in the mid-level, occupying the same zone as a territorial betta.
• Bettas are solitary and will view a school of emperor tetras as a threat to be driven from their territory.
• Emperor tetras need groups of at least 6 to feel secure, creating a persistent presence in the betta's space.
• The betta's constant aggression causes emperor tetras to hide, lose color, and eventually fail to thrive.

Minimum shared tank: 20+ gallons

No, male endlers are too colorful and active for a betta, which will treat them like rival males and attack.

• Male endlers reach only 1-1.8 inches but flash neon green, orange, and black patterns that trigger a betta's aggression.
• Bettas are carnivores that hunt at the top water level where endlers also swim, increasing encounters.
• Endlers school and dart around, and that constant movement near the surface looks like threat displays to a betta.
• A betta that decides to attack endlers will chase and nip until the endlers are stressed or dead.

Minimum shared tank: 10+ gallons

No, figure-eight puffers are 3-inch brackish aggressive fish that nip at the fins of every tankmate.

• Figure-eight puffers are aggressive and nip the fins of any fish in their tank.
• Puffers have beak-like teeth that never stop growing and need hard-shelled foods, which leads them to nip at living fins.
• Figure-eight puffers grow to 3 inches and need brackish water, conflicting with a betta's freshwater needs.
• A puffer nip to a betta's long fins causes permanent damage and stress.

Minimum shared tank: 15+ gallons

No, firemouth cichlids grow 5-6 inches and are territorial Central American cichlids that will stress or attack a 2.5-inch betta.

• Firemouth cichlids reach 5-6 inches while bettas top out at 2.5-3 inches, and the size gap means firemouths view bettas as either prey or territorial intruders.
• Firemouth cichlids are territorial bottom-dwellers that claim caves and defend them with their signature threat display and chasing behavior.
• Bettas are surface-dwellers and firemouths patrol the middle and bottom, so interaction happens whenever the betta dips down to investigate or feed.
• A 30-gallon tank is the minimum for a firemouth, which is a behaviorally different husbandry context than a betta's 5-10 gallon setup.

Minimum shared tank: 30+ gallons

No, flowerhorn cichlids grow 10-16 inches, are extremely aggressive, and will kill any fish in the tank regardless of size.

• Flowerhorn cichlids reach 10-16 inches and are among the most aggressive freshwater fish, viewing the entire tank as their territory.
• They develop nuchal humps on their foreheads and have powerful jaws capable of killing fish much larger than themselves.
• Flowerhorns need 75-125 gallons minimum and produce heavy bioload that overwhelms typical betta setups.
• They require warmer water (80-86F) than bettas, with pH 7.0-8.5, which is at the edge of betta tolerance.
• Flowerhorns attack without provocation. Even large, fast fish are not safe from their aggression.

Minimum shared tank: 75+ gallons

No, bettas and German blue rams both claim surface territory and need different water parameters, making them incompatible.

• Both bettas and rams are surface-breathing, top-water-column fish that claim territory near the surface. Putting them together means two dominant species competing for the same real estate.
• German blue rams need water at 80-86°F, which is at the upper edge of betta comfort (76-82°F) and creates a temperature compromise that shortchanges the ram's health.
• Rams are dwarf cichlids with complex social behavior and will not tolerate a territorial betta hovering over their chosen territory in a community tank.
• Rams are sensitive to water quality and temperature swings, and a betta's aggressive displays add stress that weakens a ram's immune system faster than in other species.

Minimum shared tank: 20+ gallons

No, giant danios reach 4-5 inches and are very active swimmers that need 55 gallons, stressing any betta.

• Giant danios grow to 4-5 inches and need a minimum 55-gallon tank to thrive.
• Giant danios are hyperactive swimmers that dart through the tank at high speed constantly.
• The constant movement and activity stress bettas, which prefer calm water.
• A betta cannot establish a territory in a tank with giant danios zipping around.

Minimum shared tank: 30+ gallons

No, glass catfish are fragile schooling fish that need groups of 6+ and will be harassed by bettas until they die of stress.

• Glass catfish grow 3-4 inches and need schools of at least 6 individuals to feel secure.
• They are fragile fish that lose transparency and become stressed when conditions are poor or tankmates are aggressive.
• Bettas are territorial and will attack anything with long fins or unusual movement, including glass catfish.
• Glass catfish need 30-55 gallons just for a proper school, which exceeds typical betta tank setups.
• Glass catfish are sensitive to water quality fluctuations and stress, which betta aggression exacerbates.

Minimum shared tank: 30+ gallons

No, glowlight tetras are peaceful but compete for mid-level space with bettas, and bettas will chase and attack them.

• Glowlight tetras reach 1.5 inches and school in the mid-level, occupying the same zone as a betta.
• Bettas are territorial and will view a school of glowlight tetras as an intrusion into their space.
• The betta's aggression causes glowlight tetras to scatter and hide, breaking their natural schooling behavior.
• Chronic stress in glowlight tetras leads to faded colors, poor appetite, and a shortened lifespan.

Minimum shared tank: 10+ gallons

No, bettas and goldfish cannot share a tank because bettas need 76-82 degrees Fahrenheit while goldfish need 60-72 degrees, with no overlap.

• Betta fish come from tropical waters and require a heater to maintain 76-82 degrees, while goldfish are coldwater fish that thrive at 60-72 degrees with no heater needed.
• The temperature ranges do not overlap at all, making it impossible to satisfy both species in a single tank.
• Goldfish produce a massive bioload that requires heavy filtration, which bettas in a planted setup may not appreciate.
• Bettas are finicky and may bite goldfish scales, while goldfish may outcompete bettas for food in a shared setup.

Minimum shared tank: 30+ gallons

No, green terrors grow 8-12 inches and are aggressive cichlids that will kill a betta outright.

• Green terrors reach 8-12 inches and need a minimum 55-gallon tank, far beyond a betta's setup.
• Green terrors are cichlids with strong territorial and aggressive behaviors.
• A betta's flowing fins read as prey or rival to a large cichlid.
• The size difference alone makes cohabitation dangerous for the betta.

Minimum shared tank: 55+ gallons

No, male guppy tails trigger betta aggression, and guppy activity level stresses most bettas in shared tanks.

• Bettas are hardwired to respond to long, flowing fins as rivals or threats, and male guppies have exactly the kind of display tail that sets off a betta's territory response.
• Guppies occupy the same top-to-middle swimming level as bettas, which means the betta sees them as direct competitors for prime real estate.
• Guppies breed constantly in mixed-sex tanks, and bettas will eat guppy fry on sight, creating a cycle of loss that frustrates both species' owners.
• Guppies are fast, active swimmers that dart around the tank unpredictably, which triggers the hunting reflex in many bettas even if the betta cannot actually catch them.

Minimum shared tank: 10+ gallons

No, bettas need warm 76-82F still water while hillstream loaches need cool 65-75F fast-flowing water, and these requirements are incompatible in every way.

• Betta fish need 76-82 degrees Fahrenheit, which is 6-10 degrees warmer than the 65-75 degrees hillstream loaches require.
• Hillstream loaches need high water flow from a powerhead to feel at home, and bettas are not strong swimmers that stress in strong current.
• Hillstream loaches come from fast-flowing mountain streams with cool, oxygen-rich water, and sustained temperatures above 78F cause stress and long-term decline.
• Bettas come from still or slow-moving water in warm tropical conditions, so compromise on temperature or flow hurts one or both species.

Minimum shared tank: 20+ gallons

No, bettas and honey gouramis compete for the same surface space at the top of the tank and bettas commonly attack gouramis.

• Both species are labyrinth breathers that spend significant time at the water surface, creating direct competition for their preferred zone.
• Betta males are territorial toward other labyrinth fish that share their surface area, and honey gouramis lack the speed to escape persistent harassment.
• Honey gouramis only reach 2 inches while bettas grow to 2.5-3 inches, so the betta has a clear size advantage in any confrontation.
• Bettas kept in smaller tanks are especially aggressive toward surface-dwelling tankmates, making this combination risky even in a 20-gallon.

Minimum shared tank: 10+ gallons

No, iridescent sharks grow to 36-48 inches and are pond-scale fish that will eat bettas.

• Iridescent sharks reach 36-48 inches and need a 300-gallon minimum or a pond to survive.
• They are schooling catfish that panic when alone and stress in small spaces.
• A betta is exactly the right size for an iridescent shark to view as prey.
• The tank size required for iridescent sharks makes this pairing absurdly impractical.

Minimum shared tank: 300+ gallons

No, Jack Dempsey cichlids grow 10-12 inches and are aggressive carnivores that will eat or severely harass a 2.5-inch betta in any tank.

• Jack Dempseys reach 10-12 inches while bettas top out at 2.5-3 inches, and a 12-inch cichlid does not share space with a tiny betta.
• Jack Dempseys are carnivores that eat anything small enough to fit in their mouths, and a 2.5-inch betta fits easily.
• A 55-gallon tank is the minimum for a Jack Dempsey, and even in a large tank the size and temperament gap makes cohabitation impossible.

Minimum shared tank: 55+ gallons

Yes, bettas and julii corydoras pair well in 10 gallons or larger because corydoras stay on the bottom and bother no one.

• Julii corydoras grow to 2.5 inches and spend all their time on the substrate, sifting for food.
• Bettas are surface-oriented fish that rarely venture to the bottom, so they occupy completely different zones.
• Both species thrive in temperatures of 76-79F and pH of 6.5-7.5, matching their natural ranges precisely.
• Corydoras have a bony armor and are too large to be prey for most bettas.
• Corydoras are peaceful and have no traits that provoke betta aggression.

Minimum shared tank: 10+ gallons

No, lemon tetras are peaceful but compete with bettas for space, and bettas often attack them as intruders.

• Lemon tetras reach 2 inches and school in the mid-level, directly overlapping with a betta's preferred zone.
• Bettas are territorial and view any mid-level swimmer as a threat to their space, especially in smaller tanks.
• Lemon tetras kept in groups of 6 or more may band together defensively, which can further provoke a betta.
• The stress of a betta chasing them causes lemon tetras to lose color and stop schooling normally.

Minimum shared tank: 20+ gallons

Yes, bettas and leopard danios coexist well in 20 gallons or larger, and danios stay in the upper water column away from betta territory.

• Leopard danios grow to 2 inches and are fast, active swimmers that stay in the upper to middle water column.
• Bettas are surface dwellers that patrol the top inches of water, so danios rarely cross into their zone.
• Both species tolerate temperatures of 76-79F and pH of 6.5-7.5 without stress.
• Danios are schooling fish, so a group of 6 or more disperses activity across the tank.
• Neither species is nippy enough to trigger betta aggression, and danios move too fast to be easy targets.

Minimum shared tank: 20+ gallons

No, mollies are too large and active for a betta to tolerate, and the water chemistry preferences clash in ways that benefit neither species.

• Mollies reach 4-5 inches and are strong, boisterous swimmers that will overwhelm a betta's territory in a standard 10-20 gallon setup.
• Mollies prefer hard, alkaline water (pH 7.5-8.5) while bettas do best in neutral to slightly acidic conditions (pH 6.5-7.5). There is overlap, but neither species thrives in the other's ideal range.
• Mollies are livebearers that reproduce constantly, and bettas will target pregnant females and fry, adding further stress to an already mismatched pairing.
• The betta tank minimum of 5-10 gallons is wholly inadequate for mollies, which need 20-30 gallons minimum. Keeping them together forces a compromise that shortchanges both species.

Minimum shared tank: 20+ gallons

No, bettas chase and nip neon tetras, and even peaceful bettas stress the school enough to cause color loss.

• Neon tetras stay at 1.5 inches while bettas reach 2.5-3 inches, giving bettas a clear size advantage to assert dominance.
• Betta tanks are often kept at 76-82°F, which overlaps with neon tetra temperatures (70-81°F) but the smaller tank sizes (5-10 gallon) mean tetras cannot escape the betta.
• Neon tetras school tightly and any disruption to schooling causes stress, making them poor candidates for tanks with a territorial betta.
• Betta fins are susceptible to nipping from fast-moving tankmates, which means most betta keepers avoid species that share the same swimming level.

Minimum shared tank: 10+ gallons

No, bettas and oscars do not mix because oscars are large predatory cichlids that view the betta as either a threat or food.

• Oscars grow to 12-14 inches and need at least a 75-gallon tank, while bettas reach only 2.5-3 inches and prefer small, calm setups.
• Betta fins are slow-moving targets that oscars may nip at, and oscars are strong enough to damage or kill a betta even without eating it.
• Oscars are messy carnivores that require heavy filtration and high-protein diets completely different from what bettas need.
• The size and temperament mismatch means even a momentary encounter can injure or kill the betta.

Minimum shared tank: 75+ gallons

No, paradise fish are aggressive anabantoids with the same behavior as bettas and will fight to the death.

• Paradise fish are 4-inch anabantoids with strong labyrinth organs, just like bettas.
• Both species are territorial and male-only aggression is a known trait in paradise fish.
• They share the same instinct to attack anything with long flowing fins.
• Two anabantoid males in one tank triggers territory defense behavior until one dies.

Minimum shared tank: 20+ gallons

No, pea puffers are aggressive fin-nippers that will attack betta fins and vice versa.

• Pea puffers grow to 1.4 inches and are notoriously aggressive fin-nippers in the aquarium hobby.
• They target slow-moving fish with flowing fins, which describes a betta perfectly.
• Bettas are also aggressive and will attack any fish they perceive as threatening their territory.
• Two aggressive fish in a small tank leads to constant fighting and stress for both species.

Minimum shared tank: 10+ gallons

No, peacock cichlids grow 4-6 inches and are aggressive cichlids that will eat or harass a 2.5-inch betta, and the pH requirements do not overlap.

• Peacock cichlids reach 4-6 inches while bettas top out at 2.5-3 inches, so a peacock easily views the betta as prey or competition.
• Peacock cichlids need pH 7.8-8.5 while bettas need pH 6.5-7.5, and there is no overlap in this critical parameter.
• Peacock cichlids are African cichlids from Lake Malawi with territorial and sometimes aggressive temperaments toward tankmates.
• A 55-gallon tank is the minimum for peacocks, which is a completely different husbandry context than a 5-10 gallon betta setup.

Minimum shared tank: 55+ gallons

No, bettas may attack peacock gudgeons because of their colorful fins and small body size.

• Peacock gudgeons reach 3 inches and have colorful, flowing fins that bettas target.
• Bettas are known to attack anything with bright colors that resemble their own appearance.
• Peacock gudgeons are peaceful bottom-dwellers that cannot defend themselves against a betta.
• Even peaceful bettas will sometimes nip at gudgeon fins given the opportunity.

Minimum shared tank: 15+ gallons

No, peacock spiny eels grow to 12-20 inches and are nocturnal predators that will eat bettas after lights out.

• Peacock spiny eels reach 12-20 inches and need at least a 35-gallon tank.
• They are nocturnal predators that actively hunt small fish after dark.
• Bettas are slow-moving surface dwellers that make easy prey for a hunting eel.
• Spiny eels have a strong prey drive and will eat any fish small enough to fit in their tube-like mouths.

Minimum shared tank: 35+ gallons

No, bettas and pearl gouramis do not mix because bettas view the slow-moving gourami as a territorial threat at the surface.

• Pearl gouramis reach 4.5 inches and need at least a 30-gallon tank, but even in large setups, bettas can attack them.
• Both species are labyrinth breathers that hover near the surface, and bettas are known to target any fish that occupies their space at the top of the tank.
• Pearl gouramis are slow, deliberate swimmers that cannot escape a determined betta, making them vulnerable to repeated attacks.
• Betta aggression toward gouramis is documented in the hobby even when the tank is heavily planted and the gourami is the larger fish.

Minimum shared tank: 30+ gallons

No, pictus catfish grow 4-5 inches, are active nocturnal swimmers, need 55+ gallons, and may eat bettas at night.

• Pictus catfish grow 4-5 inches and are active, fast-swimming catfish that need 55-75 gallons minimum.
• They are primarily nocturnal and become most active when bettas are resting, increasing the risk of attacks.
• Pictus catfish will eat anything small enough to fit in their mouth. Betta fry would be food, and stressed adult bettas could be attacked.
• They need schools of at least 3-5 individuals, requiring larger tanks than betta setups typically provide.
• Pictus catfish have sharp dorsal spines that can injure bettas during nighttime encounters.

Minimum shared tank: 55+ gallons

No, platies are too active and brightly colored for most bettas, and the activity level alone causes chronic stress.

• Platies are mid-to-top level swimmers that stay in the same zone as bettas, triggering territorial responses from fish that claim the entire upper water column.
• Platy colors are vivid and their movements are quick and darting, which many bettas interpret as a threat or rival rather than a neutral tankmate.
• Platies breed prolifically and a betta will target fry and pregnant platies, adding stress to an already tense cohabitation.
• Betta tanks are typically 5-10 gallons, which is too small for platies (2.5-inch active swimmers) to maintain distance from the betta.

Minimum shared tank: 10+ gallons

No, Rainbow Sharks grow 4-6 inches and are more aggressive than Red-Tailed Sharks, nip betta fins, and need a 55-gallon minimum tank.

• Rainbow Sharks grow to 4-6 inches and are more aggressive than Red-Tailed Sharks, with stronger territorial behavior throughout the tank.
• They will chase, nip, and harass anything in their territory, and bettas that dip to the mid-level or substrate become targets.
• Betta fins trailing down into a Rainbow Shark's territory read as invaders, and the shark will nip at them.
• Rainbow Sharks need a minimum of 55 gallons with plenty of caves and hiding spots, which is a completely different husbandry context than a betta tank.

Minimum shared tank: 55+ gallons

No, red eye tetras are active schooling fish that share the mid-level with bettas, and bettas will attack them as territorial intruders.

• Red eye tetras reach 2.5 inches and school in the mid-level, directly competing with a betta's preferred swimming zone.
• Red eye tetras need groups of at least 6, creating a persistent school that a betta will view as a territorial threat.
• Bettas are solitary hunters that react aggressively to groups of fish moving through their space.
• The betta's chasing behavior causes red eye tetras to scatter, stop schooling, and hide constantly.

Minimum shared tank: 20+ gallons

No, Red-Tailed Sharks grow 4-5 inches and are aggressive bottom-territorial fish that nip betta fins and need a 55-gallon minimum tank.

• Red-Tailed Sharks grow to 4-5 inches and are semi-aggressive bottom-dwellers that claim territory in the lower third of the tank.
• They will chase, nip, and harass anything in their territory, and bettas that dip to the mid-level or substrate become targets.
• Betta fins trailing down into a Red-Tailed Shark's territory read as invaders or prey, and the shark will nip at them.
• Red-Tailed Sharks need a minimum of 55 gallons with plenty of caves and hiding spots, which is a completely different husbandry context than a betta tank.

Minimum shared tank: 55+ gallons

No, rope fish are 20-24 inch nocturnal predators with a strong appetite for small fish like bettas.

• Rope fish reach 20-24 inches and need a 55-gallon minimum tank as active nocturnal hunters.
• They are obligate carnivores with a documented appetite for any fish small enough to swallow.
• Rope fish are nocturnal and hunt at night when bettas are sleeping at the surface.
• They have flexible bodies that allow them to access crevices and hunt in spaces a betta cannot escape.

Minimum shared tank: 55+ gallons

No, rosy barbs are active schooling fish that need 64-72F water, which is too cool for bettas, and they may nip betta fins.

• Rosy barbs need 64-72F water while bettas need 76-82F. There is no overlap, so one species suffers regardless of tank setup.
• Rosy barbs grow 3-4 inches and are active swimmers that can stress slow-moving bettas.
• Barbs are known fin-nippers. Betta fins trigger this behavior in active barb species.
• Bettas are slow, ornate fish that cannot escape fast-moving barbs in a community tank.
• Rosy barbs need schools of 6+ and need 30 gallons minimum, complicating any attempt at compatibility.

Minimum shared tank: 30+ gallons

No, rummy nose tetras need soft acidic water and large schools in 20+ gallons, conditions that conflict with standard betta setups.

• Rummy nose tetras are among the most water-sensitive community fish, requiring soft, acidic water (pH 5.5-7.0) at 75-84°F. These conditions do not align well with standard betta setups.
• Rummy nose tetras need groups of 8+ in a 20+ gallon tank to school properly, which conflicts with the smaller betta territories most keepers maintain.
• A betta will view a school of rummy noses as either competitors for the mid-water column or as potential prey, and the tetras' schooling formation triggers territorial aggression in many bettas.
• Rummy nose tetras lose their signature red nose coloration when stressed, making them a visible barometer of tank stress. A betta's presence almost always causes measurable stress in this species.

Minimum shared tank: 20+ gallons

No, scarlet badis grow just 0.8 inches and are micro-predators. Bettas will eat them or stress them to death.

• Scarlet badis grow only 0.8 inches and are carnivorous micro-predators that eat small invertebrates.
• Bettas will see scarlet badis as either prey or competitors and attack them.
• Scarlet badis are sensitive fish that need live or frozen foods and stable water conditions.
• They are territorial bottom-dwellers that will be harassed by bettas claiming the upper water column.
• The size difference is extreme. Even a small betta is many times the size of a scarlet badis.

Minimum shared tank: 10+ gallons

No, serpae tetras are notorious fin nippers that will shred a betta's long fins given any opportunity.

• Serpae tetras have a well-documented reputation for nipping at tankmates, especially those with long flowing fins.
• They are active schoolers that move in groups, overwhelming slower fish with their constant motion.
• A betta's fins are an irresistible target for serpae tetras once they start nipping.
• Fin damage leads to infection and death in bettas kept with persistent nippers.

Minimum shared tank: 20+ gallons

No, severum cichlids grow 8-12 inches and will see a betta as either food or a territorial threat.

• Severum cichlids reach 8-12 inches and are semi-aggressive Central American cichlids that need 55-75 gallons minimum.
• Bettas are small fish with elaborate fins that trigger predatory behavior in large cichlids.
• Severums occupy the middle water column where bettas swim, creating direct territorial overlap.
• When severums feed, they are assertive and will outcompete bettas for any food.
• Large cichlids like severums have strong jaws and can deliver fatal bites to bettas.

Minimum shared tank: 55+ gallons

No, Siamese algae eaters grow to 6 inches and are fast active swimmers that stress bettas and compete for space.

• Siamese algae eaters reach 6 inches fully grown and need at least 30 gallons, while a betta thrives in 5-10 gallons.
• SAEs are active bottom-to-mid swimmers that cruise the tank constantly. A betta interprets this as territory intrusion.
• SAEs may nip betta fins during feeding or exploration, especially as they grow larger.
• Bettas prefer slow-moving tankmates near the surface. An active SAE in the mid-column disrupts the betta's comfort zone.

Minimum shared tank: 30+ gallons

No, silver dollars grow to 6 inches, need 75 gallons, and are active schooling fish that stress bettas.

• Silver dollars reach 6 inches fully grown and need a 75-gallon tank minimum for a school of 5 or more.
• Silver dollars are schooling fish that never stop swimming. A betta in a large tank meant for silver dollars is overwhelmed by constant movement.
• Bettas prefer still water near the surface. Silver dollars occupy mid-level space and disrupt the betta's territory.
• A betta's slow-moving lifestyle and long fins are the opposite of what an active schooling fish needs to feel comfortable.

Minimum shared tank: 75+ gallons

No, both bettas and sparkling gouramis are labyrinth fish that occupy the surface, and bettas will attack anything that resembles another anabantoid.

• Bettas and sparkling gouramis are both labyrinth fish that breathe air at the water surface and prefer the top of the tank, creating direct territorial overlap.
• Bettas are territorial by nature and treat other labyrinth breathers as competitors, attacking them more readily than they would a non-anabantoid fish.
• Sparkling gouramis reach only 1.5 inches, so even a moderate charge from a betta can cause injury or death.
• Sparkling gouramis are also carnivores with similar feeding niches, so food competition adds another layer of stress.

Minimum shared tank: 10+ gallons

Yes, betta fish and sterbai corydoras coexist well in 20 gallons or larger because they occupy different levels of the tank and sterbai are too armored to trigger betta aggression.

• Bettas prefer 76-82 degrees Fahrenheit while sterbai corydoras thrive at 75-82 degrees, giving them a 6-degree shared range centered around 79 degrees.
• Bettas are surface and mid-level swimmers while sterbai corydoras stay on the bottom, so they rarely cross paths during normal activity.
• Sterbai corydoras reach 2.5 inches and have armored bodies with sharp pectoral fin spines. Their body shape and defensive plating make them poor betta targets compared to flowing-finned fish.
• Sterbai corydoras are schooling fish that stay in groups of 6 or more and move in synchronized formations, which reads as a single entity rather than individual prey to a betta.
• Both species tolerate pH 6.5-7.5, and a 20-gallon tank is large enough to give a betta swimming space while accommodating a proper corydoras school.

Minimum shared tank: 20+ gallons

No, swordtails are large, active swimmers that overwhelm a betta's space and trigger territorial aggression in confined tanks.

• Swordtails reach 5-6 inches and are energetic swimmers that need horizontal swimming room, which a standard betta tank (5-10 gallons) simply cannot provide.
• Male swordtails are semi-aggressive toward each other and can redirect that energy toward slower fish like bettas, especially in confined spaces.
• Swordtails prefer hard, alkaline water (pH 7.0-8.3) while bettas do best in neutral to slightly acidic conditions (pH 6.5-7.5). Neither fish thrives in the other's ideal water.
• Swordtails are notorious jumpers, and a betta will view any sudden movement near the surface as a challenge to its own territory.

Minimum shared tank: 20+ gallons

No, three-spot gouramis are 6-inch aggressive labyrinth fish that will attack bettas and claim their territory.

• Three-spot gouramis grow to 6 inches and are active swimmers that dominate mid-water space.
• Three-spot gouramis are labyrinth fish, like bettas, and share the same territorial instincts.
• Gouramis are known to attack fish with similar body shapes, especially those with flowing fins.
• The betta's long fins trigger aggression in three-spot gouramis, mistaking them for rivals.

Minimum shared tank: 20+ gallons

No, tiger barbs will shred a betta's flowing fins within hours of introduction, and this pairing is one of the worst possible matchups.

• Tiger barbs are notorious fin nippers, and anything with long flowing fins is a primary target for their harassment.
• Betta males have elaborate, slow-moving fins that trigger the nipping response in tiger barbs even when the barbs are well-fed.
• Tiger barbs need groups of 8 or more to redirect nipping inward, but a betta in the same tank is still fair game.
• The temperature overlap of 76-79 degrees is workable, but water parameters mean nothing when one fish is tearing apart the other.

Minimum shared tank: 20+ gallons

No, tinfoil barbs grow to 14 inches and will eat any fish small enough to fit in their mouths.

• Tinfoil barbs reach 14 inches and need a 150-gallon minimum tank as adults.
• They are large omnivores with big mouths and will view small bettas as food rather than tankmates.
• Even a juvenile tinfoil barb is too large and fast-moving for a betta setup.
• The tank size required for tinfoil barbs makes cohabitation impractical and expensive.

Minimum shared tank: 75+ gallons

No, tire track eels grow to 12-30 inches and are nocturnal predators that will eat bettas after dark.

• Tire track eels reach 12-30 inches and need a 75-gallon minimum tank.
• They are nocturnal predators that hunt after lights go off when bettas are sleeping.
• Bettas are slow-moving surface fish that make easy prey for a burrowing eel at night.
• Eels in general have a strong prey drive and will eat anything small enough to fit in their mouths.

Minimum shared tank: 75+ gallons

No, upside-down catfish need 30 gallons minimum and are schooling fish that bettas will bully or stress.

• Upside-down catfish grow to 4 inches and need a minimum 30-gallon tank to thrive.
• They are schooling fish that suffer stress when kept alone or in small groups.
• A betta will flare at and chase the catfish, causing chronic stress.
• The betta's territory and the catfish's need for open swimming space conflict.

Minimum shared tank: 20+ gallons

No, bettas need warm 76-82F water while White Cloud Mountain Minnows need cool 60-72F water, and these temperature ranges do not overlap.

• Betta fish need 76-82 degrees Fahrenheit, which is 4-10 degrees warmer than the 60-72 degrees White Cloud Mountain Minnows require.
• White Cloud Mountain Minnows are coldwater fish from mountain streams that thrive without a heater, and sustained temperatures above 75F stress them.
• Bettas are tropical fish that become lethargic and prone to disease if water drops below 76F, so there is no workable middle ground.
• Temperature mismatch is a structural incompatibility that cannot be resolved by tank size or tankmate selection.

Minimum shared tank: 10+ gallons

No, yoyo loaches grow 4-5 inches, are active bottom-dwellers that need schools of 3+, and will bump into bettas during their constant exploration.

• Yoyo loaches grow 4-5 inches and are active bottom-dwellers that patrol the tank constantly during the day.
• They need schools of at least 3-5 individuals, requiring 30+ gallons just for the loach group.
• Yoyo loaches are social and will squeeze into betta hiding spots, stressing the betta.
• They are known snail eaters and may investigate betta pellets aggressively, outcompeting the betta.
• Bettas prefer calm water and can be stressed by the constant movement of active loach schools.

Minimum shared tank: 30+ gallons

No, zebra danios are fast active swimmers that stress bettas and may nip at long flowing fins.

• Zebra danios reach 2 inches and swim in active schools at mid-levels, occupying space a betta defends.
• Zebra danios are constant swimmers. A betta sees unpredictable movement near its territory as a threat.
• Danios may nip at betta fins. Long flowing fins look like food or targets to an active schooling fish.
• Bettas prefer still water near the surface. Danios need open swimming space in the mid-column.

Minimum shared tank: 10+ gallons

No, zebra loaches need cooler water and more space than bettas, and their active schooling causes constant stress to bettas.

• Zebra loaches grow to 3-4 inches and need a group of at least 6, requiring a tank of 30 gallons minimum.
• Zebra loaches prefer water in the 68-79 F range, overlapping only at the cooler end of a betta's preferred temperature.
• Zebra loaches are active daytime foragers that dart around the tank, triggering a betta's territorial response.
• A stressed betta will clamp its fins, lose color, and stop eating, which happens quickly with loach activity.

Minimum shared tank: 20+ gallons

Yes, albino plecos and angelfish coexist peacefully in a 30-gallon tank, with wide temperature and pH overlaps that suit both species.

• Albino plecos grow to 5 inches and have armored bodies that angelfish cannot damage or treat as food.
• Both species tolerate temperatures from 76-82°F and pH ranges that overlap from 6.0 to 7.5.
• Albino plecos are nocturnal bottom dwellers that hide in caves during the day while angelfish are active in the middle level.
• Albino plecos are pale-colored variants of bristlenose plecos, sharing the same peaceful temperament that makes them compatible with cichlids.
• A 30-gallon tank provides enough vertical space for angelfish and enough floor area for pleco caves and driftwood.

Minimum shared tank: 30+ gallons

Yes, albino plecos and German blue rams share a 30-gallon tank well, with both species thriving in the 80-82 degree range.

• Albino plecos grow to 5 inches and stick to the bottom, while rams at 2.5-3 inches stay in the middle zone, so there is no competition for swimming space.
• Both species tolerate the upper end of tropical temperatures, with albino plecos comfortable up to 82 degrees and rams preferring 80-86 degrees.
• Albino plecos are herbivores that graze on algae and vegetables, while rams are carnivores that eat protein pellets and frozen foods, so they do not compete for food.
• Rams are peaceful dwarf cichlids that do not bother armored bottom-dwellers like albino plecos.

Minimum shared tank: 30+ gallons

No, albino plecos scrape oscars when oscars slow down or have injuries, and oscar aggression makes the pleco vulnerable.

• Albino plecos grow to 5-6 inches and spend time on surfaces, including oscar skin.
• Oscars are large cichlids that flare and move suddenly, but they also rest on the bottom.
• Plecos use their mouth to scrape biofilm. When an oscar has a minor injury or sits still, the pleco scrapes the wound and worsens it.
• Oscars may attack plecos that attach to their sides, leading to torn fins or torn suckers.

Minimum shared tank: 75+ gallons

Yes, angelfish and bristlenose plecos share a tank well, with matching temperatures and complementary swim levels that keep interactions minimal.

• Angelfish occupy the middle swimming level while bristlenose plecos stay on the bottom, so they rarely cross paths during the day.
• Bristlenose plecos grow to 4-6 inches with tough armor plating that angelfish cannot damage or consume.
• Both species tolerate temperatures between 76-81°F and pH from 6.5-7.5, creating a wide comfort zone for both.
• Bristlenose plecos are nocturnal and spend daylight hours hidden in caves or on driftwood, away from angelfish activity.
• A 30-gallon tank provides enough vertical height for angelfish and enough floor space for pleco hiding spots.

Minimum shared tank: 30+ gallons

No, angelfish and bronze corydoras are not compatible because angelfish will eventually attack and eat corydoras.

• Angelfish grow to 6 inches tall and are cichlids with predatory instincts that develop as they mature.
• Bronze corydoras grow to 2.5-3 inches and sit at the bottom, making them vulnerable when an angelfish matures.
• Angelfish often target corydoras specifically because they rest on the bottom and move slowly.
• The flattened body shape of corydoras resembles a tetra to an angelfish, triggering hunting behavior.
• Once an angelfish learns to hunt corydoras, losses continue until the tank is emptied of one species.

Minimum shared tank: 30+ gallons

No, adult angelfish eat cardinal tetras since a 6-inch angel can swallow a 2-inch tetra whole, even though juveniles may coexist briefly.

• Angelfish grow to 6 inches long and 8 inches tall, with mouths wide enough to swallow fish up to 1.5 inches.
• Cardinal tetras reach only 2 inches and fit easily in an adult angelfish mouth.
• Angelfish are cichlids with predatory instincts that sharpen as they mature past 3-4 inches.
• Juvenile angels often ignore small tetras for months, then start hunting once the angel reaches 3 inches.

Minimum shared tank: 30+ gallons

Yes, angelfish and congo tetras coexist in a 30-gallon tank, with both species swimming the middle column at temperatures from 76-82F.

• Angelfish at 6 inches and congo tetras at 3 inches have a significant size gap, but congo tetras are too large for angelfish to view as prey.
• Both species prefer the middle water column and will move through the tank together without territorial conflict.
• Temperature overlap spans 76-82F, giving flexibility to set the tank at 78-80F where both thrive.
• pH overlap runs from 6.0-7.5, covering the preferred range for both species comfortably.
• Congo tetras are peaceful schooling fish that ignore angelfish and focus on their own school behavior.

Minimum shared tank: 30+ gallons

No, discus need 82-86F pristine soft water while angelfish tolerate harder conditions, and angelfish often bully discus and transmit parasites.

• Discus require 82-88F water with nitrates below 10 ppm. Angelfish tolerate up to 84F but produce more waste than discus can handle.
• Discus are extremely sensitive to parasites and disease. Angelfish often carry internal parasites that do not affect them but are fatal to discus.
• Discus need pristine water and frequent 50% water changes. Angelfish bioload makes that level of water quality harder to maintain.

Minimum shared tank: 55+ gallons

No, angelfish and dwarf gouramis are both territorial cichlid-family fish that compete for the middle and top levels of the tank.

• Angelfish are semi-aggressive cichlids that reach 6 inches long and 8 inches tall, patrolling the middle and top of the tank.
• Dwarf gouramis are 3.5-inch labyrinth fish that occupy the top level and claim territory around plants and decorations.
• Angelfish will harass gouramis during feeding, outcompeting them for food at the surface where gouramis feed.
• Gouramis under stress from angelfish harassment are more likely to succumb to DGIV, which is already common in the species.

Minimum shared tank: 30+ gallons

No, angelfish harass and stress German blue rams, which are small 2.5-3 inch dwarf cichlids with peaceful, slow-moving temperaments.

• Angelfish are 6 inches long cichlids that establish territory and aggressively defend it from smaller fish.
• German blue rams reach only 2.5-3 inches and are peaceful bottom-dwelling dwarf cichlids.
• Rams are slow swimmers with no defenses against a faster, much larger cichlid that claims the mid-water column.
• Angelfish may chase rams relentlessly, causing stress, loss of color, and death in ram populations.

Minimum shared tank: 30+ gallons

Yes, angelfish and glass catfish coexist in a 30-gallon tank, with both species swimming in the middle column at overlapping temperatures.

• Both angelfish and glass catfish swim in the middle water column, but glass catfish at 3-4 inches are too large for an adult angel to consider prey.
• Temperature overlap spans 76-79F, with angelfish preferring 80F and glass catfish preferring 76F.
• pH ranges overlap from 6.0-7.5, covering both species comfortably.
• Glass catfish are peaceful schooling fish that hold their own in mid-water alongside angelfish without triggering aggression.
• A 30-gallon tank gives both species enough swimming space to avoid territorial friction.

Minimum shared tank: 30+ gallons

No, angelfish need 76-84F tropical water while goldfish thrive at 60-72F, and goldfish bioload fouls the water angelfish require.

• Angelfish require 76-84F water. Goldfish need 60-72F. There is no shared temperature range.
• Goldfish are heavy waste producers with a bioload multiplier of 4.0, making it nearly impossible to keep nitrate levels low enough for angelfish.
• Angelfish are tropical cichlids that develop health problems in cool water below 74F.
• Goldfish kept at tropical temperatures experience accelerated metabolism, stress, and shortened lifespan.
• The pH overlap (7.0-7.5) is acceptable but irrelevant because the temperature gap cannot be bridged.

Minimum shared tank: 30+ gallons

No, adult angelfish will eat guppies, and even juvenile angelfish stress guppies through semi-aggressive chasing behavior in shared territory.

• Angelfish are cichlids that grow to 6 inches and will eat any fish small enough to fit in their mouths.
• Guppies reach only 1-2.5 inches, squarely within the size range adult angelfish consider prey.
• The angelfish profile lists guppies explicitly among incompatible species alongside bettas, neon tetras, and cherry shrimp.
• Male guppies have long, colorful tails that angelfish may interpret as a target, triggering chasing and nipping behavior.
• Even when angelfish are not large enough to eat guppies outright, their cichlid temperament causes persistent harassment of small tankmates.

Minimum shared tank: 30+ gallons

No, angelfish will harass honey gouramis and compete for the same upper-tank territory, stressing the smaller gourami.

• Angelfish are 6-inch tall semi-aggressive cichlids that patrol the middle and upper water column.
• Honey gouramis are 2-inch shy labyrinth fish that stay near the surface and need dense plant cover to feel secure.
• The size difference (6 inches versus 2 inches) means the angelfish can easily dominate the gourami at feeding time.

Minimum shared tank: 30+ gallons

Angelfish and Mollies conflict on water chemistry and pose a real predation risk.

• Angelfish and Mollies occupy barely compatible pH ranges, with Mollies preferring harder, more alkaline water (7.0-8.5) while Angelfish thrive in softer, more acidic conditions (6.0-7.5). The overlap zone of 7.0-7.5 is uncomfortably tight, and sustained sub-optimal pH stresses Angelfish over time.
• Angelfish are semi-aggressive cichlids that view slow-moving, long-finned fish as targets. Adult Angelfish are large enough to injure or consume smaller Mollies, and the slow, peaceful nature of Mollies makes them easy targets for chasing and fin nipping.
• Mollies are livebearers, which means male Mollies relentlessly chase females and may also harass other tank inhabitants. In a confined aquarium this stress compounds, making a peaceful species like the Molly constantly vulnerable.

Minimum shared tank: 30+ gallons

No, adult angelfish will eat neon tetras because the tetras reach only 1.5 inches and fit easily inside a fully grown angel's mouth.

• Angelfish grow to 6 inches long and 8 inches tall, while neon tetras top out at 1.5 inches, making neons a natural prey item for adult angels.
• Angelfish are cichlids with predatory instincts that intensify as they mature past 3-4 inches.
• Juvenile angelfish often coexist with neons for months, but losses begin once the angel reaches 4+ inches, catching keepers off guard.
• Neons that survive in the same tank as an adult angelfish are chronically stressed, with faded colors and disrupted schooling behavior.

Minimum shared tank: 30+ gallons

No, oscars reach 12 inches and stress or eat angelfish, making this pairing too risky even in large tanks.

• Oscars grow to 12 inches or larger and need tanks of 75 gallons or more when fully grown.
• Angelfish max out around 6 inches and fit easily in an oscar's mouth once the oscar matures.
• Oscars are cichlids with strong territorial and predatory instincts that intensify as they grow.
• Angelfish rely on open swimming space and become severely stressed with a large cichlid present.
• The size gap alone makes peaceful coexistence unlikely in any standard home aquarium.

Minimum shared tank: 75+ gallons

No, angelfish and pearl gouramis compete for the upper tank territory and angelfish will dominate the slower-moving gourami.

• Angelfish are semi-aggressive cichlids that grow to 6 inches long and 8 inches tall.
• Pearl gouramis grow to 4.5 inches and occupy the upper water column near the surface.
• Angelfish will claim feeding territory at the surface where pearl gouramis also feed, outcompeting them.
• Pearl gouramis are peaceful and will retreat rather than defend themselves against angelfish aggression.

Minimum shared tank: 30+ gallons

Angelfish and Platies are a poor match due to the angelfish being large predatory cichlids that will likely harass or consume the small peaceful platies.

• Angelfish are semi-aggressive cichlids that can reach 6 inches in length and 8 inches in height, making them substantially larger and more predatory than platies which only grow to 2.5 inches.
• The size disparity creates a real predation risk where angelfish will view platies as prey items rather than tankmates, similar to how angelfish incompatibly lists guppies and neon tetras which are comparable in size.
• Temperature overlap exists (76-80F works for both) and pH overlap is acceptable (7.0-7.5 suits both), but these water parameter matches do not override the behavioral incompatibility of housing a predator with a small prey species.
• Neither species lists the other as incompatible, which might suggest borderline compatibility, but the general cichlid predatory behavior toward small fish is a strong enough predictor that this pairing should be avoided.

Minimum shared tank: 30+ gallons

No, adult angelfish eat rummy nose tetras since rummy noses at 2-2.5 inches are small enough to fit in a 6-inch angel's mouth.

• Angelfish grow to 6 inches long and 8 inches tall, with mouths large enough to consume fish up to 1.5-2 inches.
• Rummy nose tetras reach only 2-2.5 inches and fit in an adult angelfish mouth.
• Angelfish are cichlids with predatory instincts that activate as they mature past 3-4 inches.
• Small rummy nose schools are easy targets for an angelfish that has grown accustomed to the tank.

Minimum shared tank: 30+ gallons

Angelfish and Swordtail should not live together due to mismatched water chemistry requirements and competing semi-aggressive temperaments.

• The pH overlap is narrow and problematic; Swordtail thrives in alkaline water (7.0-8.3) while Angelfish prefers acidic to neutral conditions (6.0-7.5), making it difficult to satisfy both in a single tank.
• Both species exhibit semi-aggressive behavior, with Angelfish becoming territorial when breeding and Swordtail males actively chasing each other, which increases the likelihood of conflict.
• Swordtail is listed as compatible with cherry-barb and zebra-danio, but both of those fish appear on the Angelfish incompat list, indicating a behavioral mismatch that extends to the Angelfish pairing.
• Temperature ranges overlap only in the middle range (76-82F), which requires careful management and does not fully satisfy either species optimal comfort zone.

Minimum shared tank: 30+ gallons

No, tiger barbs will nip angelfish fins relentlessly, and angelfish are too slow to defend themselves against a fast-moving school.

• Tiger barbs are active schooling fish that nip fins when kept in groups below 8.
• Angelfish have tall, flowing fins that are a perfect target for nipping barbs.
• Angelfish are slow swimmers that cannot escape a group of barbs in a confined tank.
• Fin damage on angelfish leads to stress and secondary bacterial infections that are difficult to treat.

Minimum shared tank: 30+ gallons

Yes, bala sharks and Jack Dempsey cichlids coexist well in 75 gallons or larger with wide parameter overlaps and similar activity levels.

• Bala sharks grow to about 12 inches and Jack Dempseys reach 10-12 inches, so both species end up similar in adult size, eliminating predation risk.
• Both species tolerate wide temperature ranges of 72-82F and pH ranges of 6.5-8, giving significant flexibility in water chemistry.
• Bala sharks are active mid-level swimmers while Jack Dempseys establish territories near the bottom, so they use different zones of the tank.
• Both species are large enough to hold their own; neither will be bullied by the other in a properly sized tank.
• A 75-gallon tank provides enough room for both species to coexist without constant territorial pressure.

Minimum shared tank: 75+ gallons

No, bristlenose plecos need 73-81F while discus require 82-88F, creating a behavioral temperature mismatch.

• Bristlenose plecos thrive at 73-81F and suffer stress at sustained temperatures above 82F.
• Discus require 82-88F for long-term health and develop problems in cooler water.
• There is no overlap between these temperature ranges, making compromise impossible for both species.
• Bristlenose plecos also scrape surfaces with their mouthparts, which can damage discus slime coat if housed together.
• A tank cannot be split between two different temperature zones in a practical setup.

Minimum shared tank: 55+ gallons

Yes, bristlenose plecos and German blue rams coexist well in a 20-gallon tank or larger since both species tolerate the same 80-81 degree range.

• Bristlenoses stay at the bottom while rams patrol the middle and lower areas, so they occupy different swimming zones.
• Both species thrive at 80-81 degrees Fahrenheit, which falls in the middle of both their preferred ranges.
• Bristlenoses are armored catfish that tolerate the slightly warmer water rams require without stress.
• Rams are peaceful toward bottom-dwellers and show no interest in harassing plecos that stay out of their territory.

Minimum shared tank: 20+ gallons

No, bristlenose plecos scrape slime coats and latch onto slow-moving oscars to feed, causing wounds and stress.

• Bristlenose plecos grow to 4-5 inches and use suckermouths to scrape biofilm and algae from surfaces.
• Oscars can exceed 12 inches and produce heavy bioload, but a slow-moving oscar makes an easy target for a hungry pleco.
• Bristlenose plecos are known to latch onto the sides of large fish when algae or wood is scarce, scraping slime coat in the process.
• An oscar with a damaged slime coat becomes vulnerable to bacterial and fungal infections that spread quickly in a large cichlid tank.
• Even well-fed bristlenose plecos may still target Oscars if the pleco is bored or if wood and vegetable matter are not provided.

Minimum shared tank: 75+ gallons

No, bronze corydoras and discus cannot share a tank because their temperature requirements do not overlap at all.

• Bronze corydoras require temperatures of 72-79F for long-term health, activity, and normal lifespan.
• Discus require temperatures of 82-88F to maintain health, color, and immune function.
• The gap between 79F and 82F is absolute, leaving no comfortable middle ground for either species.
• Corydoras exposed to discus temperatures above 79F experience accelerated aging, increased stress, and organ damage over time.
• Discus kept at corydoras temperatures below 82F become prone to bacterial infections, lose color vibrancy, and stop eating.

Minimum shared tank: 55+ gallons

No, bronze corydoras and german blue rams cannot share a tank because their temperature requirements do not overlap at all.

• Bronze corydoras thrive in temperatures of 72-79F, which is their preferred range for health and activity.
• German blue rams require temperatures of 80-86F to maintain color, immune function, and breeding readiness.
• There is no temperature between 79F and 80F where both species can thrive simultaneously.
• Corydoras kept at ram temperatures above 79F experience accelerated metabolism, increased oxygen demand, and shortened lifespans.
• Rams kept at corydoras temperatures below 80F become prone to illness, lose color intensity, and fail to breed.

Minimum shared tank: 20+ gallons

No, bronze corydoras and oscars cannot share a tank because oscars are aggressive predators that will eventually eat corydoras.

• Oscars grow to 12-14 inches and are cichlids with strong predatory instincts and a voracious appetite.
• Bronze corydoras grow to 2.5-3 inches and sit defenseless on the substrate, making them easy targets for oscars.
• Oscars dig and rearrange the substrate regularly, which stresses corydoras and disrupts their feeding patterns.
• An oscar only needs to swallow a corydoras once to learn that they are food, and that behavior will repeat.
• Even young oscars will try to eat corydoras because the slow-moving bottom dweller triggers their hunting instinct.

Minimum shared tank: 75+ gallons

Yes, Buenos Aires tetras and German blue rams coexist in a 30-gallon tank, though the 2-degree temperature overlap requires running the tank at the warmer end.

• Temperature overlap sits at just 80-82F, which means the tank must run warm to accommodate both species comfortably.
• Buenos Aires tetras swim actively in the middle of the tank while rams stay near the bottom, so they occupy different zones.
• Both species grow to 2-3 inches, creating no significant size difference that would trigger predation.
• pH overlap spans 6.0-7.0, suiting both the ram preference for softer water and the Buenos Aires tolerance for a wider range.
• Buenos Aires tetras are hardy and tolerate the pristine water conditions rams require without issue.

Minimum shared tank: 30+ gallons

No, cardinal tetras and discus have no temperature overlap, with cardinals needing 73-81F and discus requiring 82-88F, which are incompatible ranges.

• Cardinal tetras need 73-81F, with 78F being the ideal temperature.
• Discus demand 82-88F, with 84F being the sweet spot for health and growth.
• The overlap between these ranges is zero. 81F is too cool for discus and 82F is too warm for cardinals.
• Cardinals held at discus temperatures above 82F experience accelerated metabolism, shortened lifespan, and stress.
• Discus kept at cardinal temperatures below 81F risk immune suppression and disease outbreaks.

Minimum shared tank: 55+ gallons

Cardinal tetras and German blue rams can share a tank with careful temperature management, and both species show positive compatibility with similar community fish such as neon tetras.

• Both species thrive in overlapping pH ranges between 5.5 and 7.0, making water chemistry compatible for a shared environment.
• The minimum tank size of 20 gallons satisfies the requirements for both species, with the bottom-dwelling ram and mid-level schooling tetras utilizing different swimming zones to reduce competition.
• Cardinal tetras are listed as compatible in the German blue ram compat list and vice versa, which is a strong positive indicator given that both species include neon tetras in their compatible fish lists.
• Both species are peaceful and similar in size, with the ram capable of gently defending territory without causing real harm to small tetras.
• The temperature overlap of 80 to 81 degrees Fahrenheit is sufficient to keep both species comfortable, provided the aquarist maintains water toward the cooler end of the overlap.
• German blue rams are bottom dwellers and the tetras occupy the middle level, reducing direct competition for space within the tank.

Minimum shared tank: 20+ gallons

Cardinal Tetras and Oscars must not be housed together due to extreme size difference and the Oscar's predatory nature toward small fish.

• The size differential between these species is extreme, with Oscars reaching 12 to 14 inches while Cardinal Tetras grow to only 2 inches at maturity.
• Oscars are carnivores that actively hunt and consume small fish. The Oscar species data explicitly lists neon-tetras as incompatible, and Cardinal Tetras are nearly identical in size and vulnerability.
• Cardinal Tetras require peaceful community conditions and are listed as incompatible with cichlids, with angelfish already on their incompatible list.
• Water parameter overlap exists for temperature and partial pH ranges, but this is irrelevant when the predator will inevitably consume the smaller species.

Minimum shared tank: 75+ gallons

Yes, common plecos and Jack Dempseys share a tank well in 75 gallons or larger because plecos stay on the bottom while Dempseys claim mid-level territory.

• Common plecos are bottom-dwellers that spend most of their time on the substrate or attached to driftwood and glass.
• Jack Dempseys are mid-level to substrate cichlids, so they claim different vertical zones in the tank.
• The temperature overlap of 72-78°F suits both species without compromise.
• pH range of 6.5-8 covers slightly acidic to alkaline water that both species tolerate.
• Common plecos grow large enough that even an aggressive Dempsey cannot harm them once they reach 8-10 inches.

Minimum shared tank: 75+ gallons

Yes, Common Plecos and Oscars work together in 75 gallons or larger, and the pleco handles waste control for the heavy-feeding cichlid.

• Common Plecos grow to 18-24 inches. Oscars reach 12-14 inches. Both need heavy footprint, not just water volume.
• Temperature overlap sits at 74-78°F, ideal for both species long-term.
• Plecos are nocturnal. Oscars are diurnal. Activity patterns reduce direct confrontation.
• pH range 6.5-8 covers both without adjustment.

Minimum shared tank: 75+ gallons

Yes, convict cichlids and Jack Dempseys coexist in 55 gallons or larger because both are New World cichlids with matching temperature and pH requirements.

• Both species thrive in the same temperature range of 75-82°F, so no heater adjustments are needed.
• The pH overlap of 6.5-8 covers slightly acidic to alkaline water that suits both cichlids.
• Convict cichlids and Jack Dempseys are similarly sized as adults, reducing the risk of one eating the other.
• Both species prefer similar hiding spots among rocks and driftwood, which simplifies tank decoration.
• A 55-gallon tank gives each fish enough space to establish its own territory without constant conflict.

Minimum shared tank: 55+ gallons

No, convict cichlids are highly aggressive cichlids that eat neon tetras and terrorize any small fish in the tank.

• Convict cichlids grow to 5-6 inches. Neon tetras stay at 1.5 inches and are easy prey for a fish of that size.
• Convict cichlids are among the most aggressive Central American cichlids, especially when breeding.
• Water parameters overlap (75-81F, pH 6.5-7.0), which makes the pairing look viable on paper.
• Convicts are prolific breeders and will guard fry aggressively, attacking anything that comes near including tetras.
• Even outside breeding season, convicts are too aggressive and predatory for small fish.

Minimum shared tank: 30+ gallons

Yes, convict cichlids and tiger barbs coexist in 30 gallons or larger because both are aggressive enough to hold their own.

• Convict cichlids grow to 5-6 inches. Tiger barbs reach 3 inches. The convict is larger but not large enough to swallow a barb.
• Convict cichlids are substrate spawners that claim a territory around their hiding spot. Tiger barbs stay in the open water column.
• Both tolerate 75-79F and pH 6.5-7.
• Tiger barbs are active and nippy. They will not be bullied by a single cichlid that stays near its cave.

Minimum shared tank: 30+ gallons

Discus and Dwarf Gourami cannot be kept together because their preferred temperature ranges do not overlap sufficiently for both species to thrive long-term.

• The temperature requirement for Discus is 82-88°F while Dwarf Gourami requires 72-82°F. The overlapping range is only 82°F, which represents the absolute upper limit of what Dwarf Gourami can tolerate and is still below the preferred range for Discus.
• Discus are extremely temperature-sensitive and require the higher end of their range for long-term health, breeding, and disease resistance. Sustaining a tank at 82°F continuously stresses the Discus.
• While both species occupy different swimming levels and share some compatible tankmates, the fundamental temperature mismatch makes this pairing unsuitable for a long-term, healthy setup.

Minimum shared tank: 55+ gallons

These two species can coexist in a spacious tank with ample line-of-sight breaks, but the pairing requires careful planning and is best suited for experienced aquarists.

• Temperature overlap of 82-86 degrees F suits both species adequately, and pH requirements are identical at 5.5-7.0, so water parameters present no barrier to cohabitation.
• Discus are middle swimmers and Rams are bottom swimmers, which means they occupy different vertical zones of the tank and are unlikely to compete for the same swimming space.
• Neither species appears on the other species incompat list, and both avoid the same problem fish like Betta, Angelfish, and Tiger Barb, suggesting no hard behavioral incompatibility in either direction.
• A 55 gallon minimum tank for Discus provides more than enough room for Rams to establish their own territory without feeling threatened.
• Rams are bold for their size and will hold their own against larger tankmates, but the real risk is stress from constant territory defense rather than physical harm.

Minimum shared tank: 55+ gallons

No, discus need 82-88F while goldfish need 60-72F, and goldfish produce heavy bioload discus cannot tolerate.

• Discus thrive in 82-88F. Goldfish thrive in 60-72F. No overlap exists.
• Discus need pristine, warm water. Goldfish produce heavy bioload and do best in cooler, cycled water.
• Goldfish pick at slow-moving discus and may sample discus food, causing digestive issues.
• pH overlaps at 7.0, but temperature and water quality mismatch make the pairing impossible.

Minimum shared tank: 55+ gallons

No, discus and guppies do not belong together because discus require temperatures of 82-88F that stress guppies, and guppies can transmit diseases to discus.

• Discus require water temperatures of 82-88F to thrive, which is significantly warmer than the 72-82F range guppies tolerate.
• Guppies kept at 82F or higher experience accelerated metabolism, shortened lifespans, and increased stress.
• Guppies are active swimmers and may harass discus, which prefer calm water and can be intimidated by fast-moving tankmates.
• Guppies are prone to parasites and bacterial infections that can devastate discus populations in a shared tank.
• Discus are slow eaters and may not get enough food if guppies intercept flakes and pellets before they sink.

Minimum shared tank: 55+ gallons

Discus require water temperatures of 82 to 88 degrees Fahrenheit while Honey Gouramis thrive at 72 to 82 degrees, creating a thermal range that cannot be safely bridged for either species.

• The temperature requirements for these two species do not overlap enough to keep both comfortable and healthy. Discus need 82 to 88 degrees Fahrenheit, while Honey Gouramis are healthiest at 72 to 82 degrees. A compromise near 82 degrees would be at the very upper limit for the Honey Gourami and only at the lowest end of acceptable for Discus, putting both at risk of stress and compromised immunity.
• The pH ranges do overlap adequately, with both species doing well between 6.0 and 7.0. Diet is not a factor since both are omnivores and can share the same staple foods without issue. Swimming levels differ, with Discus preferring mid-tank and Honey Gouramis staying near the surface, so space stratification is not a problem.
• Neither species lists the other as incompatible in their respective compatibility data. Honey Gouramis are peaceful enough not to harass Discus, and Discus are not typically aggressive toward peaceful tankmates. However, the temperature incompatibility alone is a dealbreaker for cohabitation in a shared aquarium.

Minimum shared tank: 55+ gallons

Discus and Mollies have irreconcilable temperature and pH requirements that make them poor tankmates.

• Discus require water temperatures of 82 to 88 degrees Fahrenheit, while Mollies are healthiest at the lower end of their range from 72 to 82 degrees. The overlap is only at 82 degrees, which forces a trade-off where either the Discus are kept cooler than ideal or the Mollies are kept warmer than preferred.
• Discus demand acidic water with a pH between 5.5 and 7.0, whereas Mollies thrive in alkaline conditions with a pH of 7.0 to 8.5. Only a pH of 7.0 satisfies both, and maintaining that precise midpoint in a home aquarium is impractical and risky for sensitive Discus.
• Male Mollies exhibit persistent chasing behavior toward females during breeding and may also bully subordinate males. This chronic stress from active tankmates would weaken Discus, which are notoriously sensitive to harassment and poor water conditions.

Minimum shared tank: 55+ gallons

No, discus and neon tetras cannot share a tank because discus require water above 82°F while neon tetras cannot tolerate temperatures above 81°F.

• Discus need temperatures of 82-88°F as the centerpiece of a carefully maintained aquarium.
• Neon tetras have a maximum temperature tolerance of 81°F, and sustained exposure above this range causes stress and premature death.
• The two species have no viable temperature overlap, so one species would suffer regardless of which temperature you choose.
• This parameter mismatch is why discus-compatible tankmate lists include rummy-nose tetras and cardinal tetras, not neon tetras.
• Even if the temperature problem were ignored, adult discus reach 6-8 inches and could view 1.5-inch neons as food.

Minimum shared tank: 55+ gallons

No, discus need 82-88F while oscars need 74-81F, and oscars may eat or intimidate slow discus.

• Discus require 82-88F. Oscars thrive in 74-81F. The overlap window is too narrow.
• Oscars grow to 12-14 inches and are aggressive cichlids that dominate tanks.
• Discus are slow, round-bodied fish that cannot defend themselves against oscars.
• pH overlaps at 6.0-7.0, but temperature and size difference make this pairing unworkable.

Minimum shared tank: 75+ gallons

No, discus and platies cannot share a tank. Discus require 82-88F, while platies thrive in 70-80F. The temperature gap is too wide for either species to thrive.

• Discus demand 82-88F. Platies do well at 70-80F and show stress above 82F.
• Platies kept at discus temperatures lose color, develop fin problems, and have shortened lifespans.
• Discus kept at platy temperatures (70-80F) are prone to illness and do not develop their full color or size.
• pH overlap exists at 7.0-7.0, but pH compatibility does not compensate for a missing temperature overlap.
• A 55-gallon minimum for discus is irrelevant when the two species cannot be kept at the same temperature.

Minimum shared tank: 55+ gallons

These species have incompatible temperature requirements that cannot be resolved without stressing one or both fish.

• Discus require water temperatures of 82-88 degrees Fahrenheit while Swordtails thrive at 72-82 degrees Fahrenheit, leaving only a 0-degree overlap at the absolute top end of Swordtail tolerance.
• Discus prefer acidic water in the 5.5-7.0 pH range while Swordtails need alkaline conditions between 7.0-8.3 pH, creating conflicting water chemistry preferences that compound the temperature problem.
• Neither species lists the other in their compatible or incompatible lists, which suggests neither has been successfully kept with the other in standard aquarium practice, unlike established safe pairings such as Discus with cardinal tetras or Swordtails with platies.

Minimum shared tank: 55+ gallons

No, tiger barbs nip discus and stress them, and discus require 82-88F while barbs need 74-79F.

• Discus need 82-88F. Tiger barbs thrive at 74-79F. There is no overlap.
• Tiger barbs are fast swimmers and fin-nippers. Discus are slow, round-bodied cichlids that cannot escape quickly.
• Discus require pristine water and calm surroundings. Barbs are active and disruptive.
• pH windows overlap (6.0-7.0), but temperature and behavioral mismatch make the pairing unworkable.

Minimum shared tank: 55+ gallons

No, dwarf gouramis and German blue rams compete for the same middle-to-top territory and both are territorial toward similar fish.

• Dwarf gouramis are 3.5-inch labyrinth fish that patrol the top and mid levels of the tank.
• German blue rams are 2.5-3-inch dwarf cichlids that claim bottom territory but display aggressively across the water column.
• The temperature range overlaps (80-82F) but the territorial overlap creates stress for both fish.
• Dwarf gouramis have a reputation for iridovirus, which spreads more easily when the fish are stressed by territorial disputes.

Minimum shared tank: 20+ gallons

Dwarf Gouramis cannot live with Oscars because Oscars are large carnivorous cichlids that will view the 3.5-inch gourami as food.

• The size disparity is extreme. An Oscar reaches 12 to 14 inches while a Dwarf Gourami maxes out at 3.5 inches. Any fish small enough to fit in an Oscars mouth will be eaten, and a 3.5-inch gourami easily qualifies.
• Oscars are carnivores with a documented history of eating small fish. The incompat list for Oscar includes multiple small species like neon tetras, guppies, and cherry shrimp, all of which share a similar size class with Dwarf Gourami.
• Dwarf Gourami occupies the top swimming level while Oscars swim at all levels, meaning the gourami cannot find refuge from a predator that patrols the entire tank.

Minimum shared tank: 75+ gallons

No, German blue rams need 80-86F tropical water while goldfish thrive at 60-72F, making temperature compatibility impossible.

• German blue rams require 80-86F water, with 82F being the ideal temperature.
• Goldfish are coldwater fish that need 60-72F. Any temperature that suits one species is harmful to the other.
• Goldfish are heavy waste producers with a bioload multiplier of 4.0, which fouls the pristine water rams require.
• Rams need nitrates below 10 ppm. Goldfish bioload makes that target difficult to maintain in a shared tank.
• There is no temperature range where both species are healthy at the same time.

Minimum shared tank: 30+ gallons

These species have incompatible water chemistry and overlapping temperature ranges that make cohabitation stressful for both.

• Temperature overlap is narrow at 80-82F. Rams thrive best at 84-86F while guppies prefer the cooler end of that range, forcing a compromise that suits neither optimally.
• pH ranges barely overlap at exactly 7.0. Rams need softer, more acidic water (5.5-7.0) while guppies need harder, more alkaline conditions (7.0-7.8). True overlap exists only at a single pH point, making stable water chemistry difficult to maintain long term.
• Neither species lists the other on compat or incompat lists, indicating no tested experience pairing them, but behavioral profiles do not rule out coexistence. Both are peaceful. Guppies occupy the top swimming level while rams stay at the bottom, reducing direct competition for space.

Minimum shared tank: 20+ gallons

German Blue Rams and Honey Gouramis can coexist with careful attention to temperature and tank setup.

• Temperature overlap exists at 80-82F, which accommodates both species though it sits at the cooler end for Rams and the warmer end for Honeys.
• The two species occupy opposite swimming levels, with Rams on the bottom and Honeys on the top, which reduces territorial friction in a properly sized tank.
• Neither species lists the other as incompatible, and both are peaceful dispositioned fish that tend to avoid direct conflict.

Minimum shared tank: 20+ gallons

Yes, German blue rams and kuhli loaches work well together, with both species preferring warm water and similar substrate conditions.

• Temperature overlap spans 80-86F, which suits the ram at 82F ideal and the kuhli at 78F ideal.
• pH ranges overlap from 5.5-7.0, covering both species' soft water preferences.
• Rams stay near the bottom picking through sand while kuhlis stay lower, so their territories rarely overlap.
• Kuhlis are nocturnal and ignore other fish completely, so a daytime-feeding ram poses no threat.
• Both species do best in 20-gallon tanks or larger with plenty of hiding spots.

Minimum shared tank: 20+ gallons

German Blue Rams and Mollies have incompatible water chemistry requirements and behavioral differences that make cohabitation problematic.

• The pH requirements of these two species do not overlap adequately. Rams prefer soft, acidic water in the range of 5.5 to 7.0, while Mollies require harder, alkaline water in the range of 7.0 to 8.5. The only shared pH point is 7.0, which forces one species to live at the extreme edge of its preferred range, risking long-term health and color degradation.
• The temperature ranges overlap only at 80 to 82 degrees Fahrenheit. Rams are healthiest and most colorful at the warmer end of their range. Keeping the tank at 80 to 82 degrees to accommodate Mollies places Rams slightly below their optimal temperature, potentially suppressing their immune response and vibrancy.
• Mollies are top-level swimmers and can be boisterous. Rams are bottom-dwelling, territory-holding cichlids with big personalities. A pushy male Molly could stress a Ram pair, and the behavioral mismatch in swimming levels creates friction in a shared environment.

Minimum shared tank: 20+ gallons

These two cichlids are fundamentally incompatible due to a severe size mismatch, predatory risk, and mismatched temperature requirements.

• Oscars grow to 12-14 inches and are carnivorous predators that will view the 2.5-3 inch German Blue Ram as a meal. The size differential alone makes cohabitation dangerous for the ram.
• The Oscar incompat list includes bronze-corydoras and cherry-shrimp, which are similar in size and behavior to German Blue Rams, indicating Oscars cannot be trusted with small cichlids.
• Temperature ranges overlap insufficiently: Rams require 80-86 degrees F while Oscars prefer 74-81 degrees F, creating suboptimal conditions for the ram if adjusted to suit the oscar.

Minimum shared tank: 75+ gallons

German Blue Rams and Pearl Gouramis can coexist in a properly sized and aquascaped tank, with minimal risk of conflict due to their complementary swimming levels and non-overlapping territory claims.

• Temperature overlap of 80-82F and pH overlap of 6.0-7.0 mean the tank can be set to conditions that satisfy both species simultaneously.
• German Blue Rams occupy the bottom level while Pearl Gouramis inhabit the top and middle layers, eliminating direct competition for swimming space and territory.
• Neither species lists the other on its incompatibility roster, and the Pearl Gourami is large enough (4.5 inches) that it will not be intimidated by a bonded Ram pair's bottom-level territory claims.
• Both species are genuinely peaceful, meaning the Ram's gentle chasing behavior is unlikely to escalate into harmful aggression toward a Gourami.
• Neither species requires a school, so there is no risk of aggressive schooling behavior causing conflict in a shared tank.

Minimum shared tank: 30+ gallons

German Blue Rams and Platies have fundamentally conflicting water chemistry requirements that make long-term cohabitation inadvisable.

• Platy requires hard, alkaline water with a pH of 7.0 to 8.2, while German Blue Ram thrives in soft, acidic water with a pH of 5.5 to 7.0. These ranges barely overlap at a pH of 7.0, and Rams are healthiest well below that level. Neither species can be kept in conditions optimal for the other.
• Temperature ranges also show strain. Rams prefer 78 to 85 degrees Fahrenheit while Platies cap out at 80 degrees. Rams are most comfortable at the warmer end of their range, which pushes Platies toward their upper limit and can cause stress over time.
• German Blue Rams are dwarf cichlids sensitive to water quality and prone to stress-related illness in suboptimal conditions. Platies are far hardier and will tolerate a wider range of parameters, but their waste output and different needs can gradually degrade water quality in ways that harm Rams.
• Both species are peaceful and similar in size, so aggression is not a concern. They also occupy different swimming levels (middle-bottom versus top), which reduces direct competition for space.

Minimum shared tank: 20+ gallons

These species can coexist successfully in a properly sized aquarium with adequate line of sight breaks.

• The temperature ranges overlap sufficiently at 80 to 84 degrees Fahrenheit for both species to thrive.
• The swimming level separation (bottom for rams, middle for rummy nose tetras) reduces territorial overlap and competition.
• Both species have peaceful dispositions and neither lists the other as incompatible, with both showing compatibility with shared tankmates like bronze corydoras and cherry shrimp.

Minimum shared tank: 20+ gallons

German Blue Ram and Swordtail have incompatible water chemistry requirements that make long-term cohabitation risky for the ram.

• The pH ranges have only minimal overlap at 7.0. The ram requires acidic to neutral water between 5.5 and 7.0, while the swordtail requires neutral to alkaline water between 7.0 and 8.3. Neither species will thrive at the extreme ends of this shared point.
• Temperature preferences overlap by only 4 degrees at 78 to 82 degrees Fahrenheit. The swordtail prefers cooler water and would be kept at the upper edge of its comfort range to accommodate the ram.
• The ram is listed as sensitive to water quality and requires specific conditions, while the swordtail is described as hardy. A hardy fish species in the same tank may expose a sensitive species to suboptimal conditions that it cannot tolerate.
• The swordtail grows to 5 to 6 inches while the ram reaches only 2 to 3 inches. The significant size difference could lead to the ram feeling stressed or threatened in an enclosed space.

Minimum shared tank: 20+ gallons

No, tiger barbs nip slow-moving fish and German blue rams cannot tolerate fin damage or temperature stress from this pairing.

• German blue rams need 80-86F water. Tiger barbs thrive at 74-79F. There is no temperature overlap.
• Tiger barbs are active schooling fish that nip fins when kept in groups under 8.
• Rams are slow-moving dwarf cichlids that deliberate at feeding time. Tiger barbs will outcompete them for food.
• A ram under stress from nipping will stop eating and become susceptible to hole-in-the-head disease.

Minimum shared tank: 20+ gallons

No, goldfish need 60-72F while oscars need 74-81F, and oscars will eat goldfish given the chance.

• Goldfish thrive in 60-72F. Oscars thrive in 74-81F. No overlap exists.
• Oscars grow to 12-14 inches and are predatory cichlids that treat small fish as food.
• Goldfish in the 4-6 inch range fit in an oscar mouth. Even larger goldfish get nipped.
• pH overlaps at 7.0-8.0, but temperature and predation make this pairing dangerous for goldfish.

Minimum shared tank: 75+ gallons

Yes, green terrors and Jack Dempseys coexist well in 55 gallons or larger because both are similarly sized Central American cichlids with matching care requirements.

• Green terrors grow to about 8 inches while Jack Dempseys reach 10-12 inches, so neither is small enough to become prey.
• Temperature overlap of 74-78°F suits both species without any heater tweaking.
• pH range of 6.5-8 works for both, covering moderately soft to alkaline water.
• Both species are moderately aggressive and can hold their own against each other.
• A 55-gallon tank gives each fish room to establish territory without constant confrontation.

Minimum shared tank: 55+ gallons

Yes, Green Terrors and Oscars coexist in 75 gallons or larger when given equal space and introduced at similar sizes.

• Green Terrors grow to 10-12 inches. Oscars reach 12-14 inches. Size match reduces predation risk.
• Both are South American cichlids. They share territory instincts and feeding behavior.
• Temperature overlap 74-78°F suits both species without compromise.
• pH 6.5-8 covers both without adjustment. Both adapt to harder water.

Minimum shared tank: 75+ gallons

No, oscars are large predatory cichlids that grow to 12-14 inches and will eat guppies on sight in any tank size.

• Oscars reach 12-14 inches as adults and will eat anything that fits in their mouth. Guppies stay at 1-2.5 inches. In a 75-gallon tank, an adult oscar is capable of eating every single guppy within days of introduction.
• Oscars are carnivorous cichlids with a strong prey drive. They hunt by watching for movement and lunging. Guppies are fast-moving, colorful fish that trigger this hunting response immediately.
• Guppies reproduce constantly, and oscars will quickly learn to guard the breeding area and eat every fry as it appears. No guppy colony survives intact with an oscar in the tank.
• Oscars produce massive bioload and need 75-100 gallon tanks minimum. Guppies need a heated tropical tank of 10-20 gallons. The minimum tank size for oscars is 5 times larger than what guppies need, and the oscar dominates the space entirely.
• Even a juvenile oscar will eat guppies. Oscars grow fast, reaching 6-8 inches within the first year. Any guppy present will be consumed long before the oscar reaches adult size.

Minimum shared tank: 75+ gallons

These species cannot be kept together. The Oscar will almost certainly kill and eat the Honey Gourami.

• The Oscar reaches 12-15 inches while the Honey Gourami reaches only 2 inches, making the gourami an easy target that fits entirely in the Oscar's mouth.
• The Oscar is explicitly listed as a predator that will eat any fish small enough to fit in its mouth, and Honey Gourami appears on standard Oscar-incompatible fish lists.
• The Honey Gourami is shy, slow-moving, and peaceful, which provides no defense against a large semi-aggressive cichlid and creates chronic stress for the gourami.
• While water parameters overlap (temp 74-81F, pH 6.0-7.5), these are irrelevant when one species is a documented predator of the other.

Minimum shared tank: 75+ gallons

Yes, Iridescent Sharks and Oscars coexist in 300 gallons or larger, and the shark matches the oscar's size and aggression long-term.

• Iridescent Sharks grow to 36-48 inches. Oscars reach 12-14 inches. The shark does not fit in the oscar's mouth at any stage.
• Temperature overlap 74-81°F covers both species comfortably.
• pH 6.5-7.5 suits both without adjustment.
• Iridescent Sharks are schooling fish. Keep at least three to reduce stress and minimize aggression toward tankmates.

Minimum shared tank: 300+ gallons

No, adult Jack Dempseys are large, aggressive cichlids that readily eat neon tetras in any tank size.

• Jack Dempseys grow to 8-12 inches. Neon tetras stay at 1.5 inches and are easy prey for a fish of that size.
• Jack Dempseys are cichlids known for high aggression and territorial behavior, especially as adults.
• Water parameters overlap (72-81F, pH 6.5-7.0), which makes the pairing look viable on paper.
• Even a Jack Dempsey that is not actively hunting will stress tetras through sheer presence and territory size.
• Surviving tetras will be skittish, pale, and prone to illness from chronic stress.

Minimum shared tank: 55+ gallons

Yes, Jack Dempseys and Silver Dollars do well together because both species tolerate the same warm, neutral water and occupy different swim zones in the tank.

• Jack Dempseys prefer the middle and lower levels while Silver Dollars stay in the upper-mid zone, reducing territorial overlap.
• Both species tolerate 72-82°F, so no temperature compromise is needed.
• pH overlap of 6.5-7.5 falls in the neutral range both species handle well.
• Silver Dollars grow to 6 inches and stay in schools, so they are large enough to avoid predation by an adult Jack Dempsey.
• A 75-gallon tank gives both species enough room to establish their own space.

Minimum shared tank: 75+ gallons

Mollies and Oscars are not compatible because Oscars are large predatory cichlids that will view 4 to 5 inch Mollies as food.

• Oscars grow to 12 to 14 inches and are carnivores with a strong predatory feeding response. A fully grown Oscar can easily fit a 4 to 5 inch Molly in its mouth.
• The Oscar incompat list is expansive and includes most small to medium fish species, reflecting the reality that Oscars will eat any animal that fits in their jaws. Mollies meet the size criteria for prey.
• Molly behavior describes a peaceful community fish. There is no behavioral trait listed for Mollies that would help them evade or defend against a large cichlid predator.
• Water parameter overlap exists and tank size for the pairing would be driven by the Oscar minimum of 75 gallons, but size mismatch and predatory intent make water chemistry irrelevant to the compatibility call.

Minimum shared tank: 75+ gallons

No, neon tetras and oscars cannot share a tank because oscars are large predatory cichlids that view 1.5-inch tetras as food.

• Oscars grow to 12-14 inches and are carnivorous cichlids that eat anything small enough to fit in their mouths.
• Neon tetras reach only 1.5 inches, well within the size range oscars gulp as prey even if not hungry.
• Oscars are active hunters that cruise the full water column and will notice a school of brightly colored neons moving together.
• The Oscar profile lists neon tetras explicitly among incompatible species alongside guppies, bettas, and angelfish.
• Oscar tanks are typically bare-bottom or sparsely decorated, leaving neons with no plant cover to hide behind.

Minimum shared tank: 75+ gallons

Oscars will prey on Platies, so these species should not be housed together.

• Oscars are large predatory cichlids that will eat any fish small enough to fit in their mouth.
• Platies are small, peaceful livebearers with no means of defense against a cichlid predator.
• The size difference is roughly sixfold, making the Platy an obvious target the moment it enters the tank.
• Temperature and pH ranges overlap, but the predation risk overrides any parameter compatibility.

Minimum shared tank: 75+ gallons

These two species should not be housed together because the Oscar will prey on the Rummy Nose Tetras.

• The Oscar is a documented predator that will eat any small fish, and the Rummy Nose Tetra at 2 inches qualifies as small prey.
• There is a 6 to 7 times size difference between the two species, making predation almost inevitable.
• Rummy Nose Tetras are delicate and require peaceful conditions. The presence of a large cichlid will cause chronic stress that will weaken their immune system and shorten their lifespan.
• Even if the Oscar does not immediately eat the tetras, the activity and size of the predator will disrupt the schooling behavior and natural behaviors of the Rummy Nose.

Minimum shared tank: 75+ gallons

Oscar will prey on Swordtail due to size differential and predatory nature.

• Oscar is 2-3x larger than Swordtail and is a documented cichlid predator.
• Swordtail maximum size of 6 inches makes it a target that can be swallowed whole by Oscar.
• Swordtail peaceful temperament offers no defense against potential aggression.
• pH preferences show slight incompatibility with Oscar preferring 6.0-7.5 and Swordtail preferring 7.0-8.3.

Minimum shared tank: 75+ gallons

Yes, Oscars and Tinfoil Barbs coexist in 75 gallons or larger, and the barb stays large enough to avoid becoming prey.

• Tinfoil Barbs reach 14 inches. Oscars reach 12-14 inches. The barb does not fit easily in the oscar's mouth.
• Temperature overlap 74-77°F suits both species.
• pH 6.5-7.5 covers both. Neither needs soft or hard water specifically.
• Tinfoil Barbs are active swimmers that stay in the middle and upper levels, while Oscars occupy the mid-level.

Minimum shared tank: 75+ gallons

Yes, albino plecos and swordtails share a 30-gallon tank comfortably, with the pleco grazing on the bottom and the swordtail in the upper levels.

• Albino plecos are 5-inch bottom dwellers while swordtails are 5-6 inch top-level swimmers, occupying completely different tank zones without competing for territory.
• Temperature overlap spans 72-82°F and pH overlap is 7.0-7.5, a range both species tolerate well.
• Swordtails are active during the day while albino plecos rest in caves and caves during daylight, minimizing interaction.
• Both species thrive in hard, alkaline water without requiring soft or acidic conditions that would stress either fish.

Minimum shared tank: 30+ gallons

No, axolotls and neon tetras cannot share a tank due to a 12+ degree temperature mismatch between the two species.

• Axolotls require 60-68F. Neon tetras require 72-79F. There is no overlap in their temperature ranges.
• Axolotls are carnivorous and eat anything small enough to fit in their mouths, including 1.5-inch neon tetras.
• Axolotls are ambush predators. A slow-moving tetra passing by an axolotl is an easy target.
• Keeping one species in suboptimal temperature causes long-term health problems, immune stress, and shortened lifespan.
• The pH overlap at 7.0 does not matter when the temperature gap makes co-housing impossible.

Minimum shared tank: 20+ gallons

Yes, blue emperor tetras and cardinal tetras make a stunning pair in 20 gallons or larger, with identical care requirements and matching swimming levels.

• Blue emperors grow to 1.5-2 inches and cardinals reach 2 inches, so both species stay well below each other's size threshold.
• Both species school in the middle water column, and the two schools often merge into a single flowing display.
• Temperature overlap of 73-81F suits both species, with 78F being ideal for each.
• Both prefer soft, slightly acidic water in the 6-7 pH range.
• Neither species displays aggression or fin-nipping behavior toward the other.

Minimum shared tank: 20+ gallons

Yes, blue emperor tetras and endlers share a tank well in 20 gallons or larger since both species are peaceful and occupy different water levels.

• Blue emperor tetras grow to 1.5-2 inches and swim in the middle water column.
• Endlers grow to 1-1.8 inches and prefer the top water column, so they do not compete for the same swimming zone.
• Both species tolerate temperatures of 73-81°F without stress.
• Both species are peaceful and too small to bother each other.
• Both species feed on the same flake and micropellet foods, so feeding is simple with no competition.

Minimum shared tank: 20+ gallons

Yes, blue emperor tetras and neon tetras share a tank well in 20 gallons or larger, and both species school together without aggression.

• Blue emperor tetras reach 1.5-2 inches. Neon tetras stay at 1.5 inches. Size parity means neither species fits in the other's mouth.
• Both species form tight schools and occupy the middle-water column, reducing territorial overlap.
• Temperature range 73-81°F suits both species. Blue emperors tolerate slightly cooler water than neons.
• pH 6.0-7.0 spans both preferences. Neither species is sensitive to moderate hardness changes.
• 20-gallon minimum gives both schools enough horizontal space to form distinct groups.

Minimum shared tank: 20+ gallons

Yes, blue emperor tetras and rummy nose tetras share a tank well in 20 gallons or larger, with matching care requirements and complementary colors.

• Blue emperors reach 1.5-2 inches and rummy nose tetras grow to 2-2.5 inches.
• Both species school in the middle water column and form coordinated groups.
• Temperature overlap of 75-81F suits blue emperors fully and rummy noses at the cooler end of their range.
• Both species prefer soft, slightly acidic water in the 6-7 pH range.
• Neither species displays aggression or fin-nipping behavior toward the other.

Minimum shared tank: 20+ gallons

Yes, blue emperor tetras and swordtails coexist well in 20 gallons or larger, with overlapping temperature and pH ranges that suit both species.

• Blue emperor tetras reach 1.5-2 inches and swim in the middle water column.
• Swordtails grow to 5-6 inches but stay at the top of the tank.
• Temperature overlap sits at 73-81F, matching the tetra's 72-79F preference and the swordtail's 72-82F range.
• The pH overlap of 7-7.5 suits both species without requiring special adjustments.
• Swordtails are mostly top feeders, so they rarely interact with mid-water tetras.

Minimum shared tank: 20+ gallons

Yes, blue emperor tetras and zebra danios share a tank well in 20 gallons or larger since both are peaceful schooling fish with overlapping water requirements.

• Blue emperor tetras grow to 1.5-2 inches and zebra danios grow to 2-2.5 inches, so neither can fit the other in their mouth.
• Blue emperor tetras swim in the middle water column while zebra danios prefer the top, so they use different swimming zones.
• Both species tolerate temperatures of 73-78°F without stress.
• Both species thrive in pH 6.5-7.5, which gives a clean overlap for shared water.
• Neither species is a fin-nipper toward the other, so long finnage and short finnage coexist without damage.

Minimum shared tank: 20+ gallons

Yes, bolivian rams and neon tetras coexist peacefully in 30 gallons or larger because both are calm species with matching water requirements.

• Bolivian rams grow to 3-4 inches and are among the most peaceful cichlids, rarely chasing other fish.
• Neon tetras stay at 1.5 inches and school tightly in the middle water column, away from the bottom-dwelling ram.
• Both species prefer temperatures of 72-79F and slightly acidic water around pH 6.5-7.0.
• Bolivian rams are slow swimmers and lack the speed to catch fast-moving tetras.
• Neither species is nippy, and the size gap is not extreme enough to trigger predation.

Minimum shared tank: 30+ gallons

Bristlenose Plecos and Cardinal Tetras can coexist successfully in a properly set up community tank.

• Temperature ranges overlap completely at 73-81F, making thermal comfort identical for both species.
• The Bristlenose occupies the bottom swimming level while Cardinal Tetras stay in the middle column, so vertical space competition is nonexistent.
• Both species display peaceful temperaments; the Bristlenose ignores other fish entirely and Cardinals never display aggression toward tankmates.
• Cardinal Tetras require a school of 6+ and a 30-gallon minimum tank matches the Bristlenose requirement exactly, making tank sizing straightforward.

Minimum shared tank: 20+ gallons

These species occupy different swimming zones and have overlapping environmental needs, making them well-suited tankmates.

• Bristlenose Plecos are peaceful bottom-dwellers that pose no threat to small schooling fish like Rummy Nose Tetras, which swim in the middle level of the tank.
• Temperature overlap is 75 to 81 degrees Fahrenheit, and pH overlap spans 6.5 to 7.0, providing suitable shared water parameters.
• Neither species appears on the other is incompat list, and both are documented as compatible with shared tankmates like bronze-corydoras and neon-tetra, suggesting established peaceful coexistence patterns.
• The Bristlenose is not a predator and has no documented history of preying on small tetras, even smaller species like Rummy Nose.

Minimum shared tank: 20+ gallons

Yes, bronze corydoras and neon tetras share a tank well in 20 gallons or larger, with overlapping temperatures of 72-79°F.

• Temperature overlap spans 72-79°F, which is comfortable for both species.
• Corydoras are bottom-dwelling scavengers and neon tetras are mid-level swimmers, so they occupy different tank zones.
• Both species are peaceful and school-based, creating a harmonious community dynamic.
• The 20-gallon minimum gives a school of 6 corydoras and a school of 6 neon tetras enough room to display natural behavior.

Minimum shared tank: 20+ gallons

Cardinal Tetras and Dwarf Gouramis can coexist peacefully in a well-planted tank of at least 20 gallons with only one gourami present.

• Temperature and pH ranges overlap substantially, creating compatible water parameter conditions for both species.
• The two species occupy different swimming levels, with tetras staying in the middle of the tank while gouramis prefer the top, which reduces competition for territory.
• Neither species appears on the other's incompatibility list, and harlequin rasboras and panda corydoras appear on both compatibility lists, indicating strong evidence that small peaceful fish work well together.
• Dwarf Gourami males are territorial toward other gouramis specifically, not toward small schooling fish with different body shapes, so cardinal tetras are unlikely to trigger aggressive behavior.

Minimum shared tank: 15+ gallons

Yes, cardinal tetras and endlers share a tank well in 15 gallons or larger, with matching temperature and tight pH overlap.

• Cardinal tetras reach 2 inches and form tight schools in the middle water column.
• Endlers grow only 1-1.8 inches and stay at the top, so they occupy different tank zones.
• Temperature overlap of 73-81F suits both species, with endlers tolerating up to 82F.
• The narrow pH overlap of 6.8-7 keeps both species comfortable without adjustments.
• Endlers are peaceful surface feeders that ignore mid-water tetras entirely.

Minimum shared tank: 15+ gallons

No, cardinal tetras and goldfish share no temperature overlap, with cardinals needing tropical warmth (73-81F) and goldfish requiring cool water (60-72F).

• Cardinal tetras are tropical fish needing 73-81F, with 78F being ideal.
• Goldfish are coldwater fish thriving at 60-72F, with 65F being ideal.
• The temperature overlap between these ranges is zero. There is no shared temperature that works for both.
• Goldfish in tropical water above 75F develop heat stress, accelerated aging, and shortened lifespans.
• Cardinal tetras in coldwater below 73F become sluggish, stop schooling tightly, and die from temperature shock.

Minimum shared tank: 30+ gallons

Cardinal Tetras and Guppies have overlapping temperature ranges but conflicting pH preferences, making success depend heavily on whether the aquarist can maintain stable water parameters within the narrow overlap zone.

• Cardinal Tetras require acidic to neutral water with a pH range of 5.0 to 7.0, while Guppies require alkaline to neutral water with a pH range of 7.0 to 7.8. These ranges only overlap at pH 7.0, which sits at the edge of what Cardinals prefer.
• The temperature requirements overlap comfortably between 73 and 81 degrees Fahrenheit, and both species are peaceful omnivores of similar size, eliminating aggression and dietary concerns.
• Neither species appears on the other species incompatibility list, and both are listed as compatible with similar tankmates like Neon Tetras and Cherry Shrimp, suggesting a baseline tolerance.

Minimum shared tank: 15+ gallons

Yes, cardinal tetras and harlequin rasboras thrive together in 15 gallons or larger, with overlapping soft-water preferences and matching care requirements.

• Cardinal tetras reach 2 inches and harlequin rasboras grow to 2 inches as well.
• Both species school in the middle water column, creating a combined display of coordinated movement.
• Temperature overlap spans 73-81F, matching both species' preferred ranges.
• Both prefer slightly acidic to neutral water in the 6-7 pH range.
• Neither species nips fins or displays aggression toward tankmates.

Minimum shared tank: 15+ gallons

Cardinal Tetra and Honey Gourami are well-matched in size, temperament, water parameters, and listed as mutually compatible, making them solid tankmates with only minor considerations for water softness and tank space.

• Both species reach only about 2 inches as adults, eliminating size-based aggression risks and allowing them to share the same tank comfortably.
• Temperature ranges overlap well: Cardinal Tetra at 73 to 81 F and Honey Gourami at 74 to 82 F give a shared sweet spot of roughly 74 to 81 F.
• Both species are explicitly listed as compatible on each other is compatibility lists, which is a strong positive indicator from source data.
• Both prefer subdued lighting and slow to moderate water current, and Honey Gourami is not aggressive toward other species, reducing stress risks for the tetras.

Minimum shared tank: 15+ gallons

No, cardinal tetras and mollies want opposite water chemistry, with cardinals needing soft acidic conditions and mollies requiring hard alkaline water.

• Cardinal tetras need pH 5.0-7.0 and thrive in soft, acidic blackwater with tannins and low hardness.
• Mollies prefer pH 7.5-8.5 and do best in hard, alkaline water, often with salt added.
• The pH overlap sits at exactly 7.0, which is too alkaline for wild-caught cardinals and too soft for mollies.
• Mollies grow to 4-5 inches and stay active at the surface, outcompeting 2-inch cardinals for food.
• Mollies are surface-feeders that dart and push at feeding time, leaving skittish cardinals stressed and underfed.

Minimum shared tank: 20+ gallons

Yes, cardinal tetras and panda corydoras coexist peacefully in 15 gallons or larger, with complementary swimming levels and shared water preferences.

• Cardinal tetras reach 2 inches and school in the middle water column.
• Panda corydoras grow to 2 inches and stay on the bottom, so they rarely cross paths.
• Temperature overlap sits at 73-77F, slightly cooler than cardinals prefer but manageable in a planted tank.
• Both species thrive in soft, slightly acidic water in the 6-7 pH range.
• Panda corydoras are completely peaceful and pose zero threat to any mid-water fish.

Minimum shared tank: 15+ gallons

Cardinal tetras and platies can coexist in the same tank despite some parameter tension, as both species are peaceful and share overlapping compatible species lists.

• Both species are small and peaceful with no direct behavioral conflicts. Cardinals are mid-water schooling fish while platies occupy the top of the water column, which reduces competition for swimming space.
• Temperature ranges overlap well between 73 and 80 degrees Fahrenheit, providing a comfortable shared environment for both species.
• The pH ranges do create a tension point, with cardinal tetras preferring acidic water (5.0-7.0) and platies preferring alkaline water (7.0-8.2). The overlap is minimal at pH 7.0 exactly, but this is manageable with monitoring and adjustments. Neither species is extremely sensitive to minor pH deviations within the overlap zone.
• Both compatibility lists include shared species such as neon-tetra and harlequin-rasbora, suggesting they have been successfully kept together with similar tankmates. Neither species lists the other as incompatible.
• Size difference is minimal (2 inches versus 2.5 inches), and both are omnivorous with compatible dietary needs.

Minimum shared tank: 15+ gallons

Yes, cardinal tetras and rummy nose tetras school together beautifully in 20 gallons or larger, sharing soft acidic water parameters.

• Both species are mid-level schooling tetras from South America, so they occupy the same swimming zone and schooling behavior is complementary.
• Cardinal tetras reach 2 inches and rummy nose tetras reach 2-2.5 inches, close enough in size that they school naturally together without size-based clumping.
• Temperature overlap spans 75-81°F and pH overlap is 5.5-7.0, a narrow but comfortable range for both species.
• Both prefer soft, acidic water from the Rio Negro region, giving them compatible preferences that go beyond mere tolerance.

Minimum shared tank: 20+ gallons

No, cardinal tetras and swordtails fail because cardinals need soft acidic water and swordtails require hard alkaline water, with no viable overlap.

• Cardinal tetras come from soft, acidic blackwater tributaries where pH runs 5.0-7.0 with tannins.
• Swordtails need hard alkaline water with pH 7.0-8.3, preferring mineral-rich conditions from Central American rivers.
• The pH overlap sits at 7.0, which is the high end for cardinals and the low end for swordtails.
• Swordtails grow to 5-6 inches while cardinals stay at 2 inches, creating a size mismatch for food competition.

Minimum shared tank: 20+ gallons

Tiger barbs are too boisterous and nippy to be safely housed with small, slow-moving cardinal tetras.

• Tiger barbs are documented as rowdy, fast, and prone to chasing, which creates chronic stress for peaceful schooling fish like cardinal tetras.
• Cardinal tetras reach only 2 inches and are slow swimmers, making them vulnerable targets for harassment and fin-nipping by larger, more aggressive tiger barbs that reach 3 inches.
• The species profiles do not list each other on their compat lists, and tiger barbs show a pattern of incompatibility with similar-sized small, peaceful fish like ember tetras, harlequin rasboras, and rummy nose tetras.
• Both species occupy the middle swimming level, which increases the likelihood of territorial friction and chasing behavior.
• While a heavily planted 50 gallon or larger tank with ample hiding spots might reduce aggression, it cannot eliminate the fundamental behavioral incompatibility between these species.

Minimum shared tank: 20+ gallons

Yes, celestial pearl danios and ember tetras coexist well in 10 gallons or larger, and both species prefer planted tanks with soft, slightly acidic water.

• Both species reach about 1 inch, so neither will prey on the other.
• Temperature overlap of 73-79°F and pH 6.5-7 is ideal for both species.
• Both are peaceful schooling fish that do best in groups of 6 or more.
• Celestial pearl danios are mid-water swimmers while ember tetras tend toward the lower-mid water column, giving them spatial separation in the tank.

Minimum shared tank: 10+ gallons

Yes, Cherry Barbs and Endler's Livebearers coexist in 15 gallons or larger, and both species stay small and peaceful in planted community tanks.

• Cherry Barbs grow to 2 inches. Endler's reach 1.5 inches. Neither species is large enough to prey on the other.
• Temperature overlap 73-81°F covers both without compromise.
• pH 6.8-7.5 suits both. Both tolerate slightly alkaline conditions.
• Cherry Barbs school in the mid-level. Endler's occupy the upper levels. Different swim zones reduce territorial overlap.

Minimum shared tank: 15+ gallons

Yes, cherry barbs and harlequin rasboras share a tank well in 15 gallons or larger since both are peaceful mid-water schooling fish with identical care requirements.

• Cherry barbs grow to 2 inches and harlequin rasboras grow to 1.5-2 inches, so neither can fit the other in their mouth.
• Both species tolerate temperatures of 73-81°F without stress.
• Both species thrive in pH 6.0-7.5, which gives a wide overlap for shared water.
• Cherry barbs and harlequin rasboras are both peaceful and schooling, so they coexist without aggression.
• Both species prefer planted tanks with moderate lighting, making them ideal tankmates.

Minimum shared tank: 15+ gallons

Yes, cherry barbs and rummy nose tetras share a tank well in 20 gallons or larger, with overlapping soft-water preferences and peaceful temperaments.

• Cherry barbs grow to 2 inches and rummy nose tetras reach 2-2.5 inches.
• Both species school in the middle water column and occupy the same tank zone.
• Temperature overlap of 75-81F suits cherry barbs fully and rummy noses at the lower end of their range.
• Both species prefer soft, slightly acidic water in the 6-7 pH range.
• Cherry barbs are docile despite being barbs, and they ignore smaller fish entirely.

Minimum shared tank: 20+ gallons

No, common plecos grow to 18-24 inches and need 75+ gallons, making them a tank-size mismatch for neon tetras.

• Common plecos reach 18-24 inches and require 75-100+ gallons to stay healthy long-term.
• Neon tetras stay at 1.5 inches and need heavily planted tanks with plenty of swimming space.
• The bioload of an adult common pleco is enormous , weekly water changes become burdensome with small fish.
• Common plecos sometimes suck the slime coat of slow-moving fish, especially at night when they roam.
• Temp overlap (72-78F) and pH overlap (6.5-7.0) are technically fine, but tank footprint is not.

Minimum shared tank: 75+ gallons

These two species can coexist but success depends heavily on tank size, male Gourami count, and the presence of dense plant cover.

• Temperature and pH ranges overlap comfortably, with Dwarf Gourami preferring 72-82F and pH 6.0-7.5, while Neon Tetras thrive at 70-81F and pH 6.0-7.0.
• Dwarf Gourami is listed as incompatible with no fish resembling Neon Tetras, and Neon Tetras list no Gourami species as incompatible, suggesting no inherent biological hostility between them.
• The critical risk is that male Dwarf Gouramis are known to harass fish with similar body shapes, and while Neon Tetras are not the same shape, a stressed or dominant individual Gourami in an undersized or bare tank may still display aggression toward a schooling fish hovering in the mid level.

Minimum shared tank: 10+ gallons

Dwarf Gouramis and Rummy Nose Tetras can coexist in a suitably sized and well-decorated tank, but success depends on tank dimensions, stocking density, and aquascape complexity.

• Water parameters overlap well. Dwarf Gourami prefers 72-82F and pH 6.0-7.5, while Rummy Nose Tetra prefers 75-84F and pH 5.5-7.0. The shared range of 75-82F and 6.0-7.0 is acceptable for both species.
• Swimming level separation reduces direct interaction. Dwarf Gourami occupies the top level while Rummy Nose Tetra occupies the middle level, meaning they do not frequently cross paths in the tank.
• Neither species appears on the incompatible list of the other. Rummy Nose Tetra is not listed among the fish that conflict with Dwarf Gourami, and Dwarf Gourami is not among the fish that conflict with Rummy Nose Tetra. Both species share compatible tankmates such as harlequin-rasbora, panda-corydoras, bronze-corydoras, and cherry-shrimp, which further suggests general behavioral compatibility.
• Male Dwarf Gouramis can be territorial toward similarly shaped fish. Rummy Nose Tetras are slender and shoal-based rather than labyrinth fish, so the triggering profile is lower than for other gouramis. Still, territorial stress is possible if the tank is too small or too bare.

Minimum shared tank: 20+ gallons

These species are not ideal tankmates due to shared top-water territory, differing pH preferences, and the Dwarf Gourami male's tendency to target similarly shaped fish.

• Both species prefer the top swimming level and share overlapping territory, which creates routine tension rather than occasional conflict.
• Dwarf Gourami males are documented as being territorial toward similarly shaped fish, and swordtails occupy the same niche and have a similar body shape to gouramis.
• The pH ranges have only a narrow overlap (7.0-7.5), and the Swordtail prefers harder, more alkaline water which is outside the ideal range for Dwarf Gourami.
• Both species have males that can exhibit aggression, which compounds the risk when multiple individuals are kept together.

Minimum shared tank: 20+ gallons

No, dwarf puffers are aggressive fin-nippers that attack and stress neon tetras even in large tanks.

• Dwarf puffers grow to 1.5-2.5 inches and are notoriously aggressive toward slow-moving fish with long fins.
• Neon tetras have flowing fins that trigger the nip-and-tear feeding behavior puffers use to crack shells.
• Dwarf puffers are solitary fish. They do not school and will chase any tankmate aggressively.
• Tetras nipped repeatedly develop ragged fins, infections, and chronic stress that lowers their lifespan.
• Water parameters overlap (74-81F, pH 7.0), but temperament makes this pairing unworkable.

Minimum shared tank: 20+ gallons

No, adult electric blue acaras eat neon tetras since cichlids of that size readily consume fish under 2 inches.

• Electric blue acaras grow to 6-8 inches. Neon tetras stay at 1.5 inches and fit in an adult acara's mouth.
• Acaras are cichlids with predatory feeding behavior that develops as they mature past 3 inches.
• Water parameters overlap (72-81F, pH 6.0-7.0), which makes the pairing look viable on paper.
• Tetras that survive will be chronically stressed with a large cichlid in the tank. Colors fade and schooling breaks down.
• Even well-fed acaras may still pick off slow-moving tetras as an easy snack.

Minimum shared tank: 30+ gallons

Yes, ember tetras and honey gouramis coexist in 10 gallons or larger because both are peaceful community fish that thrive in similar conditions.

• Ember tetras grow to 1 inch and school in mid-tank. Honey gouramis reach 2-3 inches and patrol the upper half.
• Honey gouramis are labyrinth breathers and ignore schooling fish below them.
• Both tolerate 73-82F and pH 6-7.
• Ember tetras stay small enough that even an unusual honey gourami shows no interest in eating them.

Minimum shared tank: 10+ gallons

Yes, endlers and glass catfishes share a tank well in 30 gallons or larger because they occupy different swimming levels and have overlapping water parameters.

• Endlers grow to 1-1.8 inches and spend their time in the top water column.
• Glass catfishes grow to 3-4 inches and swim in the middle water column, so they rarely cross paths with endlers.
• Both species tolerate temperatures of 72-79°F without stress.
• Both species thrive in pH 6.8-7.5, which gives a clean overlap for shared water.
• Glass catfishes require a 30-gallon minimum, which easily accommodates an endler school.

Minimum shared tank: 30+ gallons

Yes, Endler's Livebearers and Harlequin Rasboras coexist in 10 gallons or larger, and both species stay small and peaceful in community setups.

• Endler's Livebearers grow to 1.5 inches. Harlequin Rasboras reach 2 inches. Neither species is large enough to eat the other.
• Temperature overlap 72-82°F covers both without compromise.
• pH 6.8-7.5 suits both. Both tolerate slightly alkaline water.
• Endler's occupy the upper levels. Harlequins school in the mid-level. Different swim zones reduce interaction.

Minimum shared tank: 10+ gallons

Yes, Endler's Livebearers and Panda Corydoras coexist in 15 gallons or larger, and the cory stays on the bottom while the endler's stays near the surface.

• Endler's reach 1.5 inches. Panda Corydoras reach 2 inches. Size is comparable, neither can eat the other.
• Temperature overlap 72-77°F covers both without compromise.
• pH 6.8-7.5 suits both. Both tolerate slightly alkaline water.
• Endler's occupy the upper levels. Pandas stay on the bottom. Swim zones do not overlap during normal activity.

Minimum shared tank: 15+ gallons

No, firemouth cichlids are moderately aggressive cichlids that eat neon tetras once they reach adult size.

• Firemouth cichlids grow to 6 inches. Neon tetras stay at 1.5 inches and are easy prey for a fish of that size.
• Firemouth cichlids are cichlids with predatory instincts that develop as they mature past 3 inches.
• Water parameters overlap (75-81F, pH 6.5-7.0), which makes the pairing look viable on paper.
• Firemouths are semi-aggressive and will claim territories large enough to stress or hunt tetras.
• Surviving tetras will be chronically stressed, pale, and prone to illness.

Minimum shared tank: 30+ gallons

No, flowerhorn cichlids are 12-16 inch predators that eat neon tetras outright in any tank size.

• Flowerhorn cichlids grow to 12-16 inches and are aggressive territorial cichlids.
• Neon tetras stay at 1.5 inches and fit entirely in a flowerhorn's mouth.
• Flowerhorns are hybrid cichlids bred for color and aggression, not community tolerance.
• The temp overlap (80-81F) and pH overlap (7.0-7.0) are the only overlap points, and they are narrow.
• Flowerhorns will attack anything that moves near their territory, not just fish small enough to eat.

Minimum shared tank: 75+ gallons

Yes, glass catfishes and neon tetras share a tank well in 30 gallons or larger because both are peaceful mid-water fish with matching needs.

• Glass catfishes grow to 4-5 inches and are completely transparent, schooling fish that drift through mid-water peacefully.
• Neon tetras stay at 1.5 inches and school tightly in the middle water column, which mirrors the glass catfish preferred zone.
• Both species tolerate temperatures of 72-79F and slightly acidic water around pH 6.0-7.0.
• Glass catfishes are passive and have no predatory instincts that would target small tetras.
• Neither species is territorial, so there are no zones to defend and no conflict points.

Minimum shared tank: 30+ gallons

No, goldfish and neon tetras have incompatible temperature requirements, as goldfish need cool water while neon tetras need tropical warmth.

• Goldfish thrive in cool water between 60-72°F and do not need a heater, which is their primary appeal.
• Neon tetras require tropical temperatures of 70-81°F and need a heater to maintain stable warmth in most homes.
• The overlap sits at 70-72°F, which is too narrow for practical long-term cohabitation and leaves no margin for temperature swings.
• Beyond temperature, goldfish are opportunistic omnivores that gulp anything small enough to fit in their mouths.
• Neon tetras at 1.5 inches are within the size range goldfish can swallow, especially in a well-fed goldfish that develops a wide mouth.

Minimum shared tank: 30+ gallons

No, goldfish and rummy nose tetras share no temperature overlap, with goldfish needing cool water (60-72F) and rummy nose tetras requiring warm water (75-84F).

• Goldfish are coldwater fish thriving at 60-72F, with 65F being ideal.
• Rummy nose tetras are tropical fish needing 75-84F, with 80F being ideal.
• The temperature overlap between these ranges is zero. There is no shared temperature that works for both.
• Goldfish held above 75F develop heat stress, metabolic acceleration, and a dramatically shortened lifespan.
• Rummy nose tetras held below 73F become sluggish, lose their red nose coloration, and die from temperature shock.

Minimum shared tank: 30+ gallons

Temperature incompatibility and behavioral risks make these species poor tankmates.

• Temperature overlap is only 72F, which is the upper limit for goldfish and the lower limit for swordtails; goldfish cannot tolerate long-term tropical temperatures.
• Swordtails are semi-active and may nip at the slow-moving, flowing fins of fancy goldfish.
• Goldfish are heavy bio-load producers requiring excellent filtration, while swordtails prefer cleaner water conditions.
• Both species are omnivores with overlapping pH ranges, but the temperature barrier is the primary obstacle.

Minimum shared tank: 30+ gallons

Yes, guppies and neon tetras coexist in 10 gallons or larger with overlapping temperatures of 72-81°F and matching pH at 7.0.

• Temperature overlap spans 72-81°F, which covers both guppy's range of 72-82°F and neon tetra's range of 70-81°F.
• pH overlap sits at 7.0, which both species accept without stress.
• Guppies are top-level swimmers and neons are mid-level swimmers, so they do not crowd each other's space.
• Both are peaceful schooling species that thrive in groups of 6 or more.

Minimum shared tank: 10+ gallons

Guppy and Rummy Nose Tetra should not be housed together due to incompatible water chemistry requirements that heavily favor the tetra's health over the guppy's preference.

• pH overlap is only 7.0 exactly, which is borderline acidic for guppies while alkaline for rummy nose tetras, creating an environment where neither species truly thrives.
• Rummy Nose Tetras are sensitive bioindicators that require consistently soft acidic water to maintain their red coloration and health, and prolonged exposure to neutral or slightly alkaline conditions will stress them and cause coloration loss.
• Guppies prefer neutral to slightly alkaline water, typically around pH 7.2 to 7.8 in the upper range, which directly conflicts with what rummy nose tetras need for long term health.
• The temperature overlap is adequate and both species are peaceful, so behavior is not a barrier, but water chemistry is the overriding concern.

Minimum shared tank: 20+ gallons

No, guppies and swordtails are a poor match because male swordtails are semi-aggressive toward small, colorful livebearers and will harass guppies relentlessly.

• Male swordtails grow to 5-6 inches and are semi-aggressive toward smaller fish, especially colorful species with flowing tails.
• Guppies reach only 1-2.5 inches and have long, flowing fins that trigger chasing behavior in active male swordtails.
• Male swordtails will chase guppy males and females continuously, stressing the guppies and preventing normal feeding.
• Swordtails are top-level swimmers and outcompete guppies for food at the surface, where guppies prefer to feed.
• Even though both species prefer similar temperatures (72-82°F) and alkaline pH (7.0-7.8), temperament incompatibility makes cohabitation impractical.

Minimum shared tank: 20+ gallons

Yes, harlequin rasboras and panda corydoras share a tank well in 15 gallons or larger since they occupy different water levels and have overlapping care requirements.

• Harlequin rasboras grow to 1.5-2 inches and swim in the middle water column.
• Panda corydoras grow to 2 inches and stay on the bottom, so they rarely encounter each other.
• Both species tolerate temperatures of 72-77°F without stress.
• Both species thrive in pH 6.0-7.5, which gives a clean overlap for shared water.
• Both species are peaceful schooling fish that do well in planted community tanks.

Minimum shared tank: 15+ gallons

Yes, harlequin rasboras and rummy nose tetras coexist well in 20 gallons or larger, with matching water chemistry and complementary schooling behavior.

• Harlequin rasboras reach 2 inches and rummy nose tetras grow to 2-2.5 inches.
• Both species school in the middle water column and form coordinated groups that move together.
• Temperature overlap of 75-82F suits harlequins fully and rummy noses at the lower end.
• Both species prefer soft, slightly acidic water in the 6-7 pH range.
• Neither species nips fins or displays aggression toward the other.

Minimum shared tank: 20+ gallons

Honey Gourami and Neon Tetra share compatible water parameters, peaceful temperaments, and occupy complementary swimming zones, making them excellent tankmates in a well-maintained community setup.

• Temperature range overlap of 74-81F falls within both species preferred parameters, providing ideal thermal conditions for each.
• Both species thrive in identical pH range of 6.0-7.5 with soft water preference, eliminating water chemistry conflicts.
• Honey Gourami occupies top-middle zone while Neon Tetra schools in the middle zone, reducing competition for territory and swimming space.
• Both species are documented as mutually compatible in respective care databases with no behavioral red flags noted.

Minimum shared tank: 10+ gallons

These species can coexist successfully given adequate tank size and proper schooling numbers.

• Temperature overlap is acceptable at 75-82 degrees Fahrenheit, which accommodates both species needs.
• Neither species appears on the incompatibility list of the other, and neither is aggressive or nippy toward tankmates.
• The two species occupy different swimming levels, which reduces competition for territory and creates visual interest in the tank.

Minimum shared tank: 20+ gallons

These species can coexist but the outcome depends heavily on tank size, cover density, and the number of males in the swordtail group.

• Temperature compatibility is excellent at 72-82F for both species, eliminating thermal stress as a concern.
• The pH ranges overlap at 7.0-7.5 which is acceptable though swordtails would prefer slightly higher values long term.
• The size disparity of 2-inch honey gouramis versus 5-6-inch swordtails creates a risk of the larger fish causing stress, especially since both occupy the top swimming level where territorial disputes are most likely to occur.
• Swordtail male aggression is primarily directed at other males of the same species rather than different species, which suggests gouramis may not be targeted specifically, but individual temperament and insufficient space could change this outcome.
• Neither species lists the other in their compatibility data, which means no direct conflicts have been documented but also no established safe pairing protocols exist.

Minimum shared tank: 20+ gallons

No, mollies and neon tetras have incompatible water preferences, with mollies needing hard alkaline water and neons preferring soft acidic conditions.

• Mollies require hard, alkaline water with a pH of 7.5-8.5, while neon tetras thrive in soft, acidic water between 6.0 and 7.0.
• Many molly keepers add aquarium salt to their tanks, which neon tetras cannot tolerate at all.
• Mollies reach 4-5 inches and are boisterous swimmers that can outcompete neons for food and stress them with their activity level.
• Neon tetras are schooling fish that need groups of 10+, and a tank that satisfies mollies will leave neons in suboptimal conditions long-term.

Minimum shared tank: 20+ gallons

These two species have enough overlapping requirements to share a tank in theory, but the size disparity, Molly's known aggression toward small schooling fish, and critical pH mismatch make this pairing a poor choice that will likely cause stress or harm to the Rummy Nose Tetras.

• Molly is explicitly listed as incompatible with neon-tetra and cardinal-tetra, both of which share the same small size and schooling nature as the Rummy Nose Tetra, suggesting a consistent pattern of risk rather than an isolated concern.
• Rummy Nose Tetras grow to only 2 to 2.5 inches while Mollies reach 4 to 5 inches, creating a significant size gap that leaves tetras vulnerable to chasing and bullying by dominant Molly males.
• The pH ranges barely overlap, with Mollies requiring 7.0 to 8.5 and Rummy Nose Tetras preferring 5.5 to 7.0, meaning that meeting one species optimal range means the other is at the edge of or outside its preferred parameters.

Minimum shared tank: 20+ gallons

Yes, mollies and swordtails share a 20-gallon tank well, both preferring hard alkaline water and active upper-level swimming.

• Both species are livebearers with near-identical water preferences: 72-82°F and pH 7.0-8.3, one of the widest overlaps in this batch.
• Mollies reach 4-5 inches and swordtails reach 5-6 inches, close enough that neither can predate on the other.
• Swordtail data lists mollies as compatible and molly data lists swordtails as compatible, a strong mutual endorsement.
• Both species thrive in hard, alkaline water and do not require soft or acidic conditions that would stress either fish.
• Both are active top-level swimmers, which means they share space without competing with bottom dwellers.

Minimum shared tank: 20+ gallons

No, peacock cichlids are large predatory fish that eat neon tetras, and their pH requirements do not overlap.

• Peacock cichlids grow to 4-6 inches and are African cichlids with strong predatory instincts.
• Neon tetras stay at 1.5 inches and fit easily in an adult peacock's mouth.
• Peacock cichlids require pH 7.8-8.5 (alkaline). Neon tetras require pH 6.0-7.0 (acidic). There is no overlap.
• Keeping either species in mismatched pH causes long-term health problems including organ stress and poor coloration.
• Temperature overlap exists (76-81F), but the pH gap alone rules out cohabitation.

Minimum shared tank: 55+ gallons

Yes, neon tetras and peacock gudgeons coexist peacefully in 15 gallons or larger because both are small, calm fish with overlapping care needs.

• Peacock gudgeons grow to 2-3 inches and are peaceful bottom to mid-water dwellers that rarely bother other fish.
• Neon tetras stay at 1.5 inches and school tightly in the middle water column, keeping them out of the gudgeons space.
• Both species thrive in temperatures of 74-79F and slightly acidic water around pH 6.0-7.0.
• Peacock gudgeons are not fast swimmers and cannot catch tetras even if they tried.
• Neither species is nippy, and the size difference is modest enough that predation does not occur.

Minimum shared tank: 15+ gallons

Yes, neon tetras and pearl gouramis coexist well in 30 gallons or larger with overlapping temperatures of 77-81°F.

• Temperature overlap spans 77-81°F, which falls within pearl gourami's preferred range and is comfortable for neon tetras.
• Neon tetras are mid-level swimmers and pearl gouramis swim upper levels, reducing spatial competition.
• A school of 10-12 neon tetras against a 4-5 inch pearl gourami poses zero predation risk.

Minimum shared tank: 30+ gallons

No, pictus catfishes actively hunt neon tetras at night and will decimate a school even in a 55-gallon tank.

• Pictus catfishes grow to 5 inches and are nocturnal predators that hunt when other fish sleep.
• Neon tetras stay at 1.5 inches and lack any real defense against a quick-moving catfish.
• The temp overlap (75-81F) and pH overlap (6.5-7.0) look fine on paper, but behavior overrides water chemistry.
• Pictus catfishes have wide mouths relative to their body size, built to swallow fish whole.
• Tank size does not solve this problem , a pictus catfish will hunt neons regardless of gallons.

Minimum shared tank: 55+ gallons

No, rainbow sharks are aggressive fish that nip fins and stress neon tetras even in large community tanks.

• Rainbow sharks grow to 4-6 inches and are aggressive territorial fish that claim large portions of the tank.
• Neon tetras stay at 1.5 inches. Sharks of 4-6 inches are fast enough to catch and nip slow-moving tetras.
• Rainbow sharks are notorious fin-nippers, especially toward fish that share their swimming level.
• Tetras nipped repeatedly develop ragged fins, infections, and chronic stress that lowers their lifespan.
• Water parameters overlap (72-79F, pH 6.5-7.0), which makes the pairing look viable on paper.

Minimum shared tank: 55+ gallons

No, red-tailed sharks are aggressive fish that nip fins and stress neon tetras even in large community tanks.

• Red-tailed sharks grow to 4-6 inches and are aggressive territorial fish that claim large portions of the tank.
• Neon tetras stay at 1.5 inches. Sharks of 4-6 inches are fast enough to catch and nip slow-moving tetras.
• Red-tailed sharks are notorious fin-nippers, especially toward fish that share their swimming level.
• Tetras nipped repeatedly develop ragged fins, infections, and chronic stress that lowers their lifespan.
• Water parameters overlap (72-79F, pH 6.5-7.0), which makes the pairing look viable on paper.

Minimum shared tank: 55+ gallons

No, severum cichlids are large predatory fish that eat neon tetras once they reach adult size.

• Severum cichlids grow to 7-12 inches. Neon tetras stay at 1.5 inches and are easy prey for a fish of that size.
• Severum cichlids are cichlids with predatory instincts that develop as they mature past 4 inches.
• Water parameters overlap (72-81F, pH 6.0-7.0), which makes the pairing look viable on paper.
• Even peaceful severums will eat small fish that wander into their strike range.
• Surviving tetras will be chronically stressed with a large cichlid in the tank. Colors fade and schooling breaks down.

Minimum shared tank: 55+ gallons

Water chemistry incompatibility makes this pairing risky despite behavioral compatibility.

• Neon Tetras require soft, acidic water while Swordtails need hard, alkaline water, with only a narrow pH overlap at 7.0-7.5.
• Size disparity is significant: Swordtails grow 3x larger, which could create stress for Neons even if Swordtails are not inherently aggressive.
• Temperature range overlaps well at 72-81F, so temperature is not a limiting factor.
• Both species are generally peaceful, but maintaining stable water conditions in the narrow overlap zone requires careful maintenance.

Minimum shared tank: 20+ gallons

Neon tetras should not be housed with tiger barbs because the barbs are known fin-nippers that can injure or kill the small tetras.

• Tiger barbs are documented fin-nippers that target slower, smaller fish like neon tetras.
• Neon tetras are delicate, schooling fish that rely on a peaceful environment to thrive.
• Although temperature and pH ranges overlap, the behavioral incompatibility outweighs any environmental overlap.
• Reported cases show neon tetras suffering torn fins, chronic stress, and death when kept with tiger barbs.

Minimum shared tank: 20+ gallons

Yes, panda corydoras and rummy nose tetras coexist peacefully in 20 gallons or larger, with complementary swimming levels and shared water chemistry.

• Panda corydoras reach 2 inches and stay on the bottom of the tank.
• Rummy nose tetras grow to 2-2.5 inches and school in the middle water column.
• Temperature overlap sits at 75-77F, which suits both species without compromise.
• Both species prefer soft, slightly acidic water in the 6-7 pH range.
• Panda corydoras are completely peaceful and pose no threat to any mid-water fish.

Minimum shared tank: 20+ gallons

These soft-water species share compatible temperature, pH, and temperament profiles making them a standard and recommended pairing for community aquariums.

• Temperature overlap of 77-82F suits both species without compromise.
• pH range 6.0-7.0 accommodates both preferences with soft water compatibility.
• Both are peaceful species with no territorial or aggressive tendencies toward each other.
• Both thrive in similar Amazon-style biotope conditions with soft, slightly acidic water.

Minimum shared tank: 30+ gallons

Significant water chemistry mismatch makes long term cohabitation problematic despite temperature and size compatibility.

• Pearl Gourami requires soft water while Swordtail requires hard water; this fundamental difference in natural habitat chemistry creates chronic stress for one or both species.
• pH overlap of 7.0-7.5 is tight and requires careful monitoring; lower end stresses Swordtails while higher end stresses Pearl Gouramis.
• Both species occupy top water column creating potential territorial competition, especially with semi-aggressive Swordtail males.
• Size compatibility is good but shared swimming zone increases aggression risk between species.

Minimum shared tank: 30+ gallons

Hard-water platies and soft-water rummy nose tetras have incompatible chemistry despite overlapping temperature.

• pH overlap is only 7.0 exactly, which is too narrow to maintain stably in a mixed community tank.
• Platy requires hard water but rummy nose tetras need soft water, and these requirements are mutually exclusive.
• Rummy nose tetras are sensitive bioindicator fish that will suffer if water chemistry shifts toward the alkaline range platies need.
• Stable pH at 7.0 would require constant monitoring and could drift toward either species suboptimal range.

Minimum shared tank: 20+ gallons

Yes, platies and swordtails share a 20-gallon tank well, with overlapping hard water preferences and compatible temperaments.

• Both species thrive in hard, alkaline water from pH 7.0-8.2 and temperatures of 72-80°F, giving them a wide comfortable overlap.
• Swordtails reach 5-6 inches while platies stay at 2.5 inches, a size gap that means the platy is at minimal risk in a well-stocked tank.
• Both are top-level swimmers and livebearers, which means they occupy similar tank zones but are not direct competitors.
• Both species eat similar foods, simplifying feeding in a shared tank.

Minimum shared tank: 20+ gallons

Water chemistry mismatch makes long-term cohabitation inadvisable despite overlapping temperature range.

• pH overlap exists only at 7.0, which is the absolute upper limit for Rummy Nose Tetra and the absolute lower limit for Swordtail.
• Rummy Nose Tetra requires soft acidic water as a documented bioindicator species, while Swordtail requires hard alkaline water to maintain health and coloration.
• Swordtail grows to 5-6 inches and may cause stress to 2-inch Rummy Nose Tetras through size disparity alone, even without aggression.
• Temperature compatibility is not a saving factor when the fundamental mineral content and pH requirements are mutually exclusive.

Minimum shared tank: 20+ gallons

No, tiger barbs nip the flowing fins and slow-moving rummy nose tetras, causing stress, injury, and eventual death in the tetra school.

• Tiger barbs are notorious fin nippers that target slow-moving fish with long or flowing fins.
• Rummy nose tetras are slow swimmers with delicate bodies and no defensive spines to deter harassment.
• Rummy nose tetras at 2-2.5 inches are small and slow enough for tiger barbs at 3 inches to outpace.
• Tiger barbs need groups of 8 or more to redirect nipping within the school. Without this, nipping targets tankmates.

Minimum shared tank: 20+ gallons

Yes, swordtails and zebra danios coexist well in 20 gallons or larger, with danios schooling near the surface and swordtails using the mid to upper water column.

• Zebra danios are small active schooling fish at 2-2.5 inches that spend most of their time at the surface and upper water column.
• Swordtails are larger at 5-6 inches but are peaceful top-level swimmers that ignore smaller fish and pose no threat to zebra danio schools.
• Both species are active swimmers with no fin-nipping tendencies toward each other, and they tolerate similar water conditions.
• Temperature overlap of 72-78 degrees Fahrenheit suits both species, with zebra danios tolerating the lower end and swordtails preferring the warmer end.
• Both species prefer slightly alkaline water with the overlap of 7.0-7.5 being comfortable for each.

Minimum shared tank: 20+ gallons

Yes, Albino Plecos and Apistogrammas coexist in 30 gallons or larger, and the pleco stays on the bottom while the apistogramma claims the mid-level.

• Albino Plecos grow to 6 inches. Apistogrammas reach 3 inches. The pleco is too large for the apistogramma to bother.
• Temperature overlap 72-82°F covers both species without compromise.
• pH 6.0-7.0 suits both. Both prefer slightly acidic water.
• Plecos are nocturnal and hide during the day. Apistogrammas are diurnal. Activity cycles do not overlap.

Minimum shared tank: 30+ gallons

Both species occupy the same bottom-dwelling niche and will compete for territory and food, making cohabitation inadvisable despite their individual peacefulness.

• Both species are Ancistrus bottom-dwellers with nearly identical diets, swimming levels, and hiding preferences, meaning they compete directly for the same resources in the same tank zone.
• Ancistrus species are peaceful but can exhibit territorial behavior toward similar-looking bottom-dwellers, especially in smaller tanks where hiding spots and grazing territory are limited.
• Both species are nocturnal and emerge at the same time to feed, increasing the likelihood of direct competition at feeding areas and cave spaces.
• Neither species list includes the other in their compatibility profiles, and the Albino Pleco explicitly lists the Common Pleco (another large bottom-dwelling catfish) as incompatible, suggesting a pattern of niche-based conflict among plecos.

Minimum shared tank: 30+ gallons

Yes, albino plecos and guppies coexist well in 30 gallons or larger with full temperature overlap at 72-82°F.

• Temperature overlap spans the full range from 72-82°F, perfect compatibility between both species.
• Albino plecos are bottom-dwelling nocturnal grazers; guppies are top-level diurnal swimmers, so they rarely interact.
• Albino plecos grow to only 5 inches and pose zero threat to guppies of any size.
• The 30-gallon minimum handles the combined bioload of one albino pleco and a school of 6-8 guppies comfortably.

Minimum shared tank: 30+ gallons

Yes, Albino Plecos and Keyhole Cichlids coexist in 30 gallons or larger, and both species tolerate similar water conditions without stress.

• Albino Plecos grow to 6 inches. Keyhole Cichlids reach 4-5 inches. Size difference is manageable with hiding spots available.
• Temperature overlap 72-78°F suits both species without compromise.
• pH 6.0-7.5 covers both without adjustment.
• Keyhole Cichlids are peaceful for a cichlid. They do not claim territory aggressively enough to bother the pleco.

Minimum shared tank: 30+ gallons

Yes, albino plecos and kribensis coexist well in a 30-gallon tank, with both species preferring the bottom and similar water conditions.

• Albino plecos grow to 5 inches and are too large for kribensis at 4 inches to consider prey or serious competition.
• Both species prefer the bottom of the tank but occupy different niches: plecos graze on surfaces and driftwood while kribensis claim caves.
• Temperature overlap spans 75-82F, with albino plecos preferring 77F and kribensis preferring 78F.
• pH ranges overlap from 6.0-7.5, covering both species comfortably.
• Albino plecos are armored with bony plates and tolerate occasional kribensis territorial nudges without injury.

Minimum shared tank: 30+ gallons

Yes, albino plecos and mollies share a 30-gallon tank comfortably, with the pleco on the bottom and mollies in the upper levels.

• Albino plecos are 5-inch bottom dwellers while mollies are 4-5 inch top-level swimmers, so they use completely different tank zones.
• Temperature overlap spans 72-82°F and pH overlap is 7.0-7.5, a range both species handle well.
• Mollies are diurnal and active during the day while plecos rest in caves during daylight hours, minimizing interaction.
• Both species prefer similar water hardness and alkalinity levels.

Minimum shared tank: 30+ gallons

Yes, American flagfish and peppered corydoras coexist well in a 10-gallon tank with a stable temperature of 72F and pH of 6.5-7.5.

• American flagfish are surface-dwelling killifish that grow to 2-3 inches and rarely venture to the bottom where corydoras spend their time.
• Peppered corydoras are bottom-dwelling catfish that stay on the substrate and in the lower levels, avoiding the flagfish entirely.
• Both species tolerate the same temperature of 72F and overlapping pH range of 6.5-7.5.
• A 10-gallon tank is sufficient because the two species occupy opposite zones and do not compete for space.

Minimum shared tank: 10+ gallons

Yes, apistogrammas and peppered corydoras share a 20-gallon tank well, with matching parameters and non-overlapping bottom zones.

• Apistogrammas are dwarf cichlids that stay at 2-3 inches and occupy the lower-to-mid levels, while corydoras stay on the substrate, so territorial overlap stays minimal.
• Temperature overlap of 72-79F suits both species comfortably without compromise.
• pH range of 6-7 is ideal for peppered corydoras and acceptable for most apistogramma species, keeping water chemistry simple.
• Corydoras are peaceful bottom dwellers that pose no threat to apistogrammas, and their armored bodies resist any minor aggression from the cichlids.
• A 20-gallon tank gives enough horizontal space for apistogramma pairs to establish territories while corydoras school along the substrate.

Minimum shared tank: 20+ gallons

Yes, blue emperor tetras and bronze corydoras make excellent tankmates in 20 gallons or larger, occupying completely different water levels without competing for space.

• Blue emperor tetras are mid-water schooling fish that stay in the middle of the tank, while bronze corydoras stay on the substrate and bottom.
• Blue emperor tetras reach only 1.5-2 inches and are peaceful schooling fish that pose no threat to corydoras of similar size.
• Both species need schools of 6 or more to feel secure, with blue emperor tetras schooling in open water and corydoras foraging together on the bottom.
• Temperature overlap of 73-79 degrees Fahrenheit and pH range of 6.0-7.5 suits both species comfortably.
• Bronze corydoras grow to 2.5 inches and ignore small mid-water fish, leaving blue emperor tetras unbothered in the upper column.

Minimum shared tank: 20+ gallons

Yes, blue emperor tetras and pygmy corydoras share a tank well in 20 gallons or larger since both are peaceful schooling fish with overlapping water requirements.

• Blue emperor tetras grow to 1.5-2 inches and swim in the middle water column.
• Pygmy corydoras grow to 1 inch and are bottom dwellers, so they rarely encounter each other.
• Both species tolerate temperatures of 73-79°F without stress.
• Both species thrive in pH 6.4-7.4, which gives a clean overlap for shared water.
• Both species are schooling fish that do best in groups of 6 or more.

Minimum shared tank: 20+ gallons

Yes, Blue Emperor Tetras and Rubber Lip Plecos do well together because both species are peaceful and share compatible water parameters in a planted community tank.

• Blue Emperor Tetras are schooling fish at 1.5-2 inches that stay in the mid-water column and leave bottom dwellers alone.
• Rubber Lip Plecos are calm algae grazers at 6-7 inches that pay no attention to tetras swimming above them.
• Both species tolerate the temperature range of 73-81F and pH of 6.5-7.5, making water chemistry straightforward to manage.
• The 25-gallon minimum gives the tetra school room to swim comfortably while the pleco has plenty of glass and decor surface area to graze on.

Minimum shared tank: 25+ gallons

Yes, Blue Emperor Tetras and Siamese Algae Eaters do well together because both species are peaceful and thrive in similar water conditions without competing for territory.

• Blue Emperor Tetras are schooling fish at 1.5-2 inches, while Siamese Algae Eaters grow to 4-6 inches as solitary or loosely social fish.
• Siamese Algae Eaters are bottom-to-mid-level grazers, while Blue Emperor Tetras stay in the mid-water column, so they do not overlap in swimming zones.
• Both species tolerate the narrow temperature range of 75-79F and pH of 6.5-7.5 without stress.
• The 30-gallon minimum gives the SAE enough horizontal swimming space to feel comfortable while the tetra school patrols the middle.

Minimum shared tank: 30+ gallons

Yes, Bolivian rams and bronze corydoras coexist well in 30 gallons or larger, with minimal territory overlap since rams claim bottom areas while cories stay on the substrate.

• Bolivian rams are dwarf cichlids that claim small territories near driftwood or rocks, and they rarely patrol the substrate where corydoras forage.
• Bronze corydoras stay on the substrate and sift through sand for food, sticking to the bottom while rams hover and sift nearby.
• Both species thrive in the same temperature range of 72-79 degrees Fahrenheit and pH between 6.5-7.5.
• A 30-gallon tank provides enough floor space for corydoras groups of 6 or more while leaving open swimming areas for ram territories.
• Bronze corydoras are schooling fish that stay in groups, so they pose no threat to the territorial but non-aggressive ram.

Minimum shared tank: 30+ gallons

These species occupy different swimming levels and have no listed conflicts, making them suitable tankmates in an appropriately sized aquarium.

• Bristlenose Pleco and Dwarf Gourami occupy different swimming levels, with the pleco preferring the bottom and the gourami preferring the top. This spatial separation greatly reduces the likelihood of territorial disputes.
• Both species share overlapping temperature and pH requirements, with the pleco tolerating 73 to 81 degrees Fahrenheit and the gourami tolerating 72 to 82 degrees Fahrenheit. The pH ranges of 6.5 to 7.5 for the pleco and 6.0 to 7.5 for the gourami also overlap comfortably.
• Neither species appears on the other species compatibility list as incompatible. The pleco is listed as compatible with betta and angelfish, and the gourami is not listed as incompatible with any bottom-dwelling species.
• Both species are peaceful by nature. The main behavioral concern with dwarf gouramis involves male-to-male aggression among gouramis themselves, not aggression toward unrelated species.
• A tank of at least 20 gallons with plenty of hiding spots such as driftwood, caves, and plants will help both species feel secure and reduce any potential stress.

Minimum shared tank: 20+ gallons

No, bristlenose plecos need 73-81F while goldfish prefer 60-72F, making this temperature conflict impossible to resolve.

• Bristlenose plecos originate from South American rivers and require 73-81F for long-term health.
• Goldfish are coldwater fish that thrive at 60-72F and struggle when temperatures exceed 75F.
• These temperature ranges have no overlap, so one species will always be stressed regardless of tank setup.
• Bristlenose plecos also produce significant bioload and need wood and vegetable matter that goldfish tanks do not provide.
• Cooling a tropical tank or warming a goldfish tank both lead to chronic stress and disease in one of the species.

Minimum shared tank: 30+ gallons

These two species make excellent tankmates due to complementary swimming zones, overlapping water parameters, and matching temperaments.

• Water parameters align nearly perfectly. Bristlenose Plecos prefer 73-81F and pH 6.5-7.5 while Honey Gouramis thrive at 72-82F and pH 6.0-7.5, creating a wide overlap that satisfies both species without compromise.
• Swimming zone separation eliminates territorial conflict. The pleco inhabits the bottom level while the gourami occupies the upper water column, so these species essentially ignore each other and rarely interact.
• Both species are peaceful and neither appears on the other species incompatibility list. The pleco is a calm bottom dweller and the gourami is one of the most docile freshwater fish available, making aggression between them virtually impossible.
• The pleco is primarily herbivorous while the gourami is more omnivorous, meaning they have different dietary preferences that reduce competition for food. The pleco will handle algae and biofilm cleanup while the gourami takes floating foods.
• A minimum 20-gallon tank easily accommodates both species with room to spare, satisfying the pleco requirement while giving the gourami ample upper-swimming space.

Minimum shared tank: 20+ gallons

Yes, bristlenose plecos and kribensis work well together in a 20-gallon tank, with both species preferring the bottom and similar water conditions.

• Bristlenose plecos at 4-6 inches are too large for kribensis at 4 inches to consider prey or competition.
• Both species prefer the bottom of the tank but occupy different niches: plecos graze on surfaces while kribensis claim caves and surrounding territory.
• Temperature overlap spans 75-81F, with bristlenose preferring 77F and kribensis preferring 78F.
• pH ranges overlap from 6.5-7.5, covering both species comfortably.
• Bristlenoses are armored with bony plates and tolerate occasional kribensis aggression without injury.

Minimum shared tank: 20+ gallons

Yes, bristlenose plecos and kuhli loaches coexist well in a 20-gallon tank, with both species preferring the bottom and similar water conditions.

• Bristlenose plecos at 4-6 inches are too large for kuhli loaches at 4 inches to consider prey, and vice versa.
• Both species prefer the bottom of the tank but occupy different niches: plecos graze on surfaces and driftwood while kuhlis burrow through sand.
• Temperature overlap spans 73-81F, with bristlenose preferring 77F and kuhli preferring 78F.
• pH ranges overlap from 6.5-7.0, covering both species comfortably.
• Neither species shows aggression toward the other, and their night foraging rarely overlaps in territory.

Minimum shared tank: 20+ gallons

Bristlenose Plecos and Platies are peaceful tankmates that occupy different zones of the aquarium with no significant conflicts.

• Both species are peaceful by nature with no predatory or aggressive tendencies toward one another.
• Bristlenose Plecos are bottom-dwelling nocturnal fish while Platies are active top-level swimmers, meaning they occupy entirely different swimming zones and rarely compete for space or resources.
• Temperature ranges overlap substantially (73 to 80 degrees Fahrenheit) and both species thrive in similar water conditions with only a minor pH overlap (7.0 to 7.5) that is easily managed with monitoring.
• Both species appear on each other's compatibility lists with similar community fish such as bronze-corydoras and neon-tetra, indicating established community tank success.
• The size difference (4 to 6 inches versus 2.5 inches) presents no issue since Bristlenose Plecos are docile grazers rather than territorial or aggressive toward smaller tankmates.

Minimum shared tank: 20+ gallons

Yes, bronze corydoras and glass catfish share a 30-gallon tank well, with cories on the bottom and glass catfish schooling in the middle water column.

• Bronze corydoras are bottom-dwelling schooling fish that stay on the substrate, while glass catfish are mid-water swimmers that school together in the open water.
• Glass catfish reach 3-4 inches and are completely transparent peaceful schooling fish, not predators that would bother corydoras.
• Both species need schools of at least 6 individuals to feel secure and display natural behavior.
• Temperature overlap of 72-79 degrees Fahrenheit and pH range of 6.0-7.5 suits both species equally.
• Glass catfish prefer subdued lighting and gentle currents, which aligns with the calm bottom environment that corydoras prefer.

Minimum shared tank: 30+ gallons