Can Blue Emperor Tetra Live With Swordtail?
Yes, blue emperor tetras and swordtails coexist well in 20 gallons or larger, with overlapping temperature and pH ranges that suit both species.
Why
- 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.
What could go wrong
Male swordtails can be pushy and may outcompete tetras at feeding time if portions are not spread out.
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 73-81°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.
Related compatibility questions
Keep reading
Planning a community tank?
Check compatibility for any two freshwater species before you buy. Stop guessing, stop returning fish.
Open the compatibility chart →