Can Rummy Nose Tetra Live With Swordtail?
Maybe, with caveats. Both species tolerate similar water parameters and occupy different swim zones, but swordtails are larger and may fin-nip.
Why
- Rummy nose tetras stay at 2 inches and prefer to school in the middle water column. Swordtails at 4-5 inches also stay mid-level.
- Temperature overlap of 75-82°F and pH overlap of exactly 7 work for both species.
- Swordtails are livebearers that can be active and boisterous, potentially stressing the more sedate rummy nose tetras.
- Rummy nose tetras are sensitive to water quality and may not handle the higher bioload that swordtails produce.
- Both species are peaceful by nature, which reduces outright aggression risk.
What could go wrong
Rummy nose tetras may fade in color and stop schooling if stressed by active swordtail tankmates or poor water conditions.
Gear for a shared tank
Sized for the 20 gallon minimum this pairing needs. Affiliate links — we earn a small commission if you buy through them.
AquaClear 30 Power Filter
Oversized filtration is what lets you stock two species together without water quality crashing. Rated for a tank slightly larger than the 20 gallon minimum.
Eheim Jager 150W Thermostat Heater
Holds a steady temperature inside the 75-82°F window both species need.
API Freshwater Master Test Kit
Keep ammonia, nitrite, and nitrate in check. Two-species tanks have more bioload and less margin for error than single-species setups.
Better pairings to consider
Corydoras catfish or smaller rasboras pair well with swordtails in a 20-gallon planted tank.
Related compatibility questions
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