HomeCompare fishDwarf rainbowfish vs Redtail splitfin Dwarf rainbowfish vs Redtail splitfin: can they live together? Verdict: With cautionThe Redtail splitfin can be semi-aggressive or nip fins.Both are comfortable at 22–28°C (72–82°F).A pH of 6.5–7.5 suits both.Minimum tank for the pair: 150 L (40 US gal)Side by sideDwarf rainbowfishRedtail splitfinAdult size5 cm (2 in)6 cm (2.4 in)Minimum tank150 L (40 US gal)75 L (20 US gal)Temperature22–28°C (72–82°F)15–32°C (59–90°F)pH6.5–7.56.0–8.0Hardness8–18 dGH (143–321 ppm)9–19 dGH (161–339 ppm)TemperamentPeacefulSemi-aggressiveCommunity tankGoodGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesDwarf rainbowfishMelanotaenia praecoxRedtail splitfinXenotoca eiseni