Can Discus Live With Swordtail?
Maybe, with caveats , discus and swordtails share a narrow temperature and pH window, but their activity levels and social needs differ enough to make this a cautious pairing.
Why
- Discus require 82-86°F and Swordtails top out around 82°F, leaving no safety margin if the tank runs warm.
- Both species prefer alkaline water around pH 7, so parameter overlap is solid on that front.
- Discus are slow, deliberate swimmers that do best in groups of five or more , active swordtails may stress them out.
- Swordtails are livebearers that breed readily, and discus will not protect fry from being eaten.
- The 55-gallon minimum gives both species room, but discus need pristine water that swordtail bioload could compromise.
What could go wrong
Swordtails may outcompete discus for food during feeding time, leading to discus losing condition over weeks.
Gear for a shared tank
Sized for the 55 gallon minimum this pairing needs. Affiliate links — we earn a small commission if you buy through them.
Fluval 307 Performance Canister Filter
Oversized filtration is what lets you stock two species together without water quality crashing. Rated for a tank slightly larger than the 55 gallon minimum.
Eheim Jager 300W Thermostat Heater
Holds a steady temperature inside the 82-82°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
Discus pair well with rummynose tetras or corydoras. Swordtails do well with platies, mollies, or other livebearers.
Related compatibility questions
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