HomeCompare fishMolly vs Butterfly splitfin Molly vs Butterfly splitfin: can they live together? Verdict: With cautionTheir temperature ranges only just meet, at 26°C (79°F).A pH of 7.5–8.0 suits both.Minimum tank for the pair: 75 L (20 US gal)Side by sideMollyButterfly splitfinAdult size10 cm (3.9 in)8 cm (3.1 in)Minimum tank–75 L (20 US gal)Temperature21–26°C (70–79°F)26–32°C (79–90°F)pH7.5–8.26.0–8.0Hardness11–30 dGH (196–535 ppm)9–19 dGH (161–339 ppm)TemperamentPeacefulPeacefulCommunity tank–GoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesMollyPoecilia sphenopsButterfly splitfinAmeca splendens