HomeCompare fishLake Kutubu rainbowfish vs Forktail rainbowfish Lake Kutubu rainbowfish vs Forktail rainbowfish: can they live together? Verdict: With cautionThe Lake Kutubu rainbowfish grows about twice as long as the Forktail rainbowfish; watch for bullying or predation.Their temperature ranges only just meet, at 24°C (75°F).A pH of 7.0–8.0 suits both.Minimum tank for the pair: 210 L (55 US gal)Side by sideLake Kutubu rainbowfishForktail rainbowfishAdult size10 cm (3.9 in)5 cm (2 in)Minimum tank210 L (55 US gal)75 L (20 US gal)Temperature20–24°C (68–75°F)24–26°C (75–79°F)pH7.0–8.06.0–8.0Hardness9–12 dGH (161–214 ppm)5–12 dGH (89–214 ppm)TemperamentPeacefulPeacefulCommunity tankGoodGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesLake Kutubu rainbowfishMelanotaenia lacustrisForktail rainbowfishPseudomugil furcatus