HomeCompare fishRed rainbowfish vs Pearl danio Red rainbowfish vs Pearl danio: can they live together? Verdict: With cautionThe Red rainbowfish grows about twice as long as the Pearl danio; watch for bullying or predation.Both are comfortable at 22–25°C (72–77°F).A pH of 7.0–8.0 suits both.Minimum tank for the pair: 150 L (40 US gal)Side by sideRed rainbowfishPearl danioAdult size12 cm (4.7 in)5 cm (2 in)Minimum tank150 L (40 US gal)75 L (20 US gal)Temperature22–25°C (72–77°F)20–25°C (68–77°F)pH7.0–8.06.0–8.0Hardness9–19 dGH (161–339 ppm)5–19 dGH (89–339 ppm)TemperamentPeacefulPeacefulCommunity tankGoodExcellentCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesRed rainbowfishGlossolepis incisusPearl danioDanio albolineatus