The molly (Poecilia sphenops) is a peaceful fish that grows to about 4 inches and spends its time in mid-water. Keep at least 3 together, in a tank of 20 gallons or more, at 72–82°F and pH 7.5–8.5.
20 galsmallest tank
4″adult size
72–82°Ftemperature
7.5–8.5pH
3+group size
Peacefultemperament
Good tankmates
Avoid
- ✕Cardinal tetra: Molly and Cardinal tetra prefer different water (pH 7.5–8.5 vs 4.5–7).
- ✕Ember tetra: Molly and Ember tetra prefer different water (pH 7.5–8.5 vs 5.5–7).
- ✕Rummy-nose tetra: Molly and Rummy-nose tetra prefer different water (pH 7.5–8.5 vs 5.5–7).
- ✕Chili rasbora: Molly and Chili rasbora prefer different water (pH 7.5–8.5 vs 4–7).
- ✕Paradise fish: Paradise fish is aggressive and best kept alone.
- ✕German blue ram: Molly and German blue ram prefer different water (pH 7.5–8.5 vs 5–7).
- ✕Convict cichlid: Convict cichlid is aggressive and best kept alone.
- ✕Oscar: Oscar is aggressive and best kept alone.
From TankCoach's own species data: common hobby guidance for adults, rounded. Individual fish vary. Not veterinary advice.