Can Goldfish Live With Molly?
Maybe, with caveats -- goldfish and mollies only meet at 72F, and goldfish are coldwater while mollies are tropical, making long-term cohabitation difficult.
Why
- Goldfish are coldwater fish that thrive at 65-72F and do not tolerate temperatures above 75F for extended periods.
- Mollies are tropical fish that thrive at 72-82F and need warmth above 72F to stay healthy and active.
- The only temperature overlap is 72F, which is the low end for mollies and the high end for goldfish.
- A 30-gallon tank gives both species room, but maintaining the narrow overlap long-term is challenging.
What could go wrong
Either the goldfish overheats if you push the tank above 75F for the molly, or the molly chills if you keep the tank at 72F or below.
Gear for a shared tank
Sized for the 30 gallon minimum this pairing needs. Affiliate links — we earn a small commission if you buy through them.
AquaClear 70 Power Filter
Oversized filtration is what lets you stock two species together without water quality crashing. Rated for a tank slightly larger than the 30 gallon minimum.
Eheim Jager 200W Thermostat Heater
Holds a steady temperature inside the 72-72°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
Goldfish do well with other coldwater species like dojo loaches or hillstream loaches; mollies do well with platies or swordtails in a tropical tank.
Related compatibility questions
Keep reading
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