HomeCompare fishRed rainbowfish vs Dwarf rainbowfish Red rainbowfish vs Dwarf rainbowfish: can they live together? Verdict: With cautionThe Red rainbowfish grows about twice as long as the Dwarf rainbowfish; watch for bullying or predation.Both are comfortable at 22–25°C (72–77°F).A pH of 7.0–7.5 suits both.Minimum tank for the pair: 150 L (40 US gal)Side by sideRed rainbowfishDwarf rainbowfishAdult size12 cm (4.7 in)5 cm (2 in)Minimum tank150 L (40 US gal)150 L (40 US gal)Temperature22–25°C (72–77°F)22–28°C (72–82°F)pH7.0–8.06.5–7.5Hardness9–19 dGH (161–339 ppm)8–18 dGH (143–321 ppm)TemperamentPeacefulPeacefulCommunity tankGoodGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesRed rainbowfishGlossolepis incisusDwarf rainbowfishMelanotaenia praecox