HomeCompare fishLake Kutubu rainbowfish vs Javanese ricefish Lake Kutubu rainbowfish vs Javanese ricefish: can they live together? Verdict: With cautionThe Lake Kutubu rainbowfish grows about twice as long as the Javanese ricefish; watch for bullying or predation.Both are comfortable at 20–24°C (68–75°F).A pH of 7.5–8.0 suits both.Minimum tank for the pair: 210 L (55 US gal)Side by sideLake Kutubu rainbowfishJavanese ricefishAdult size10 cm (3.9 in)4.5 cm (1.8 in)Minimum tank210 L (55 US gal)75 L (20 US gal)Temperature20–24°C (68–75°F)20–24°C (68–75°F)pH7.0–8.07.5–8.5Hardness9–12 dGH (161–214 ppm)2–10 dGH (36–178 ppm)TemperamentPeacefulPeacefulCommunity tankGoodWith cautionCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesLake Kutubu rainbowfishMelanotaenia lacustrisJavanese ricefishOryzias javanicus