Neon Tetra

Neon tetras are the quintessential community fish. That electric blue and red stripe combination is instantly recognizable, and a school of 10 or more swimming together is one of the most beautiful sights in freshwater fishkeeping. They are small, peaceful, and relatively easy to care for once your tank is cycled. The key word there is cycled. Neon tetras are sensitive to ammonia and nitrite, so adding them to a brand-new tank is a recipe for losses. Get your nitrogen cycle established first, then add neons. Once settled in a stable environment, they are hardy little fish that can live 5-8 years.

A 10-gallon tank is the minimum for a school of 6, but 20 gallons is much better since it gives the school room to swim in formation and makes water chemistry more forgiving. Use a standard hang-on-back filter or sponge filter. Neons come from blackwater streams in South America, so they appreciate a dimmer environment. Add floating plants, driftwood, and plenty of mid-level plants for cover. Dark substrate makes their colors pop dramatically. Avoid overly bright lighting, which can stress them and wash out their coloring.

Temperature should be 70-81 degrees Fahrenheit, with 74 being ideal. Neons prefer slightly acidic to neutral water with a pH between 6.0 and 7.0. They are sensitive to ammonia and nitrite, so your tank must be fully cycled before adding them. Ammonia and nitrite should always read 0 ppm. Nitrate should stay below 20 ppm. Perform 25% water changes weekly. Acclimate new neons slowly using the drip method over 30-60 minutes, since sudden parameter shifts can cause neon tetra disease.

Neon tetras are omnivores and easy to feed. A high-quality micro pellet or crushed flake food works as a staple. Supplement with frozen baby brine shrimp, daphnia, or micro worms 2-3 times per week. Their mouths are tiny, so make sure food is small enough for them to eat. Feed a small amount once or twice daily, only what they can consume in about 2 minutes. Neons will eat from all levels of the tank but prefer mid-water feeding.

Neons are peaceful schooling fish. They need to be in groups of at least 6, but 10-12 is where their behavior really shines. In a proper school, they swim together in coordinated formations, change direction simultaneously, and display brighter colors. A lone neon or a pair will hide, stress out, and fade in color. They are active during the day and rest near the bottom at night. Their colors fade while sleeping, which is normal.

Neon tetras are ideal community fish. They do well with other peaceful species of similar size. Great tankmates include guppies, bronze corydoras, cherry shrimp, harlequin rasboras, and other small tetras. Avoid anything large enough to eat them (angelfish can be a problem once they grow) or aggressive species like cichlids and tiger barbs. Keep them with fish that share similar water parameter preferences.

Neon tetra disease (NTD) is a parasitic infection specific to this species. Symptoms include fading color, erratic swimming, a lumpy body shape, and the fish separating from the school. Unfortunately, there is no cure for true NTD, and infected fish should be removed to prevent spread. Ich is another common issue, showing as white spots on the body. Treat by raising temperature to 82 degrees gradually and using an ich medication. Fin rot from poor water quality can also occur. The best prevention for all these conditions is maintaining clean, stable water.

Breeding neon tetras is challenging but possible. They are egg scatterers and need specific conditions: very soft, acidic water (pH around 5.5-6.0), dim lighting, and a separate breeding tank. The pair spawns in the early morning, scattering eggs among fine-leaved plants or spawning mops. Remove the adults after spawning since they will eat the eggs. Eggs hatch in about 24 hours, and fry are extremely small. Feed infusoria for the first week, then move to baby brine shrimp.