HomeCompare fishForktail rainbowfish vs Redtail splitfin Forktail rainbowfish vs Redtail splitfin: can they live together? Verdict: With cautionThe Redtail splitfin can be semi-aggressive or nip fins.Both are comfortable at 24–26°C (75–79°F).A pH of 6.0–8.0 suits both.Minimum tank for the pair: 75 L (20 US gal)Side by sideForktail rainbowfishRedtail splitfinAdult size5 cm (2 in)6 cm (2.4 in)Minimum tank75 L (20 US gal)75 L (20 US gal)Temperature24–26°C (75–79°F)15–32°C (59–90°F)pH6.0–8.06.0–8.0Hardness5–12 dGH (89–214 ppm)9–19 dGH (161–339 ppm)TemperamentPeacefulSemi-aggressiveCommunity tankGoodGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesForktail rainbowfishPseudomugil furcatusRedtail splitfinXenotoca eiseni