HomeCompare fishRed rainbowfish vs Yellowbelly gudgeon Red rainbowfish vs Yellowbelly gudgeon: can they live together? Verdict: With cautionThe Yellowbelly gudgeon is best kept in a species tank.The Red rainbowfish grows about twice as long as the Yellowbelly gudgeon; watch for bullying or predation.Both are comfortable at 22–25°C (72–77°F).A pH of 7.0 suits both.Minimum tank for the pair: 150 L (40 US gal)Side by sideRed rainbowfishYellowbelly gudgeonAdult size12 cm (4.7 in)4.5 cm (1.8 in)Minimum tank150 L (40 US gal)55 L (15 US gal)Temperature22–25°C (72–77°F)21–26°C (70–79°F)pH7.0–8.05.5–7.0Hardness9–19 dGH (161–339 ppm)2–5 dGH (36–89 ppm)TemperamentPeacefulPeacefulCommunity tankGoodNot suitableCare levelEasyDifficultDietOmnivoreOmnivoreSpecies profilesRed rainbowfishGlossolepis incisusYellowbelly gudgeonAllomogurnda nesolepis