HomeCompare fishMountain rainbowfish vs Murray river rainbowfish Mountain rainbowfish vs Murray river rainbowfish: can they live together? Verdict: CompatibleBoth are comfortable at 18–22°C (64–72°F).A pH of 6.5–7.2 suits both.Minimum tank for the pair: 210 L (55 US gal)Side by sideMountain rainbowfishMurray river rainbowfishAdult size10 cm (3.9 in)9 cm (3.5 in)Minimum tank210 L (55 US gal)150 L (40 US gal)Temperature18–22°C (64–72°F)18–22°C (64–72°F)pH6.5–7.26.5–7.2TemperamentPeacefulPeacefulCommunity tankWith cautionWith cautionCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesMountain rainbowfishMelanotaenia monticolaMurray river rainbowfishMelanotaenia fluviatilis