HomeCompare fishDwarf rainbowfish vs Murray river rainbowfish Dwarf rainbowfish vs Murray river rainbowfish: can they live together? Verdict: With cautionTheir temperature ranges only just meet, at 22°C (72°F).A pH of 6.5–7.2 suits both.Minimum tank for the pair: 150 L (40 US gal)Side by sideDwarf rainbowfishMurray river rainbowfishAdult size5 cm (2 in)9 cm (3.5 in)Minimum tank150 L (40 US gal)150 L (40 US gal)Temperature22–28°C (72–82°F)18–22°C (64–72°F)pH6.5–7.56.5–7.2Hardness8–18 dGH (143–321 ppm)–TemperamentPeacefulPeacefulCommunity tankGoodWith cautionCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesDwarf rainbowfishMelanotaenia praecoxMurray river rainbowfishMelanotaenia fluviatilis