HomeCompare fishDwarf rainbowfish vs Butterfly splitfin Dwarf rainbowfish vs Butterfly splitfin: can they live together? Verdict: CompatibleBoth are comfortable at 26–28°C (79–82°F).A pH of 6.5–7.5 suits both.Minimum tank for the pair: 150 L (40 US gal)Side by sideDwarf rainbowfishButterfly splitfinAdult size5 cm (2 in)8 cm (3.1 in)Minimum tank150 L (40 US gal)75 L (20 US gal)Temperature22–28°C (72–82°F)26–32°C (79–90°F)pH6.5–7.56.0–8.0Hardness8–18 dGH (143–321 ppm)9–19 dGH (161–339 ppm)TemperamentPeacefulPeacefulCommunity tankGoodGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesDwarf rainbowfishMelanotaenia praecoxButterfly splitfinAmeca splendens