HomeCompare fishMountain rainbowfish vs Javanese ricefish Mountain rainbowfish vs Javanese ricefish: can they live together? Verdict: With cautionThe Mountain rainbowfish grows about twice as long as the Javanese ricefish; watch for bullying or predation.Their preferred pH ranges don't overlap.Both are comfortable at 20–22°C (68–72°F).Minimum tank for the pair: 210 L (55 US gal)Side by sideMountain rainbowfishJavanese ricefishAdult size10 cm (3.9 in)4.5 cm (1.8 in)Minimum tank210 L (55 US gal)75 L (20 US gal)Temperature18–22°C (64–72°F)20–24°C (68–75°F)pH6.5–7.27.5–8.5Hardness–2–10 dGH (36–178 ppm)TemperamentPeacefulPeacefulCommunity tankWith cautionWith cautionCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesMountain rainbowfishMelanotaenia monticolaJavanese ricefishOryzias javanicus