HomeCompare fishRed rainbowfish vs Northern trout gudgeon Red rainbowfish vs Northern trout gudgeon: can they live together? Verdict: With cautionThe Northern trout gudgeon can be semi-aggressive or nip fins.Both are comfortable at 24–25°C (75–77°F).A pH of 7.0–7.8 suits both.Minimum tank for the pair: 150 L (40 US gal)Side by sideRed rainbowfishNorthern trout gudgeonAdult size12 cm (4.7 in)17.5 cm (6.9 in)Minimum tank150 L (40 US gal)150 L (40 US gal)Temperature22–25°C (72–77°F)24–26°C (75–79°F)pH7.0–8.06.0–7.8Hardness9–19 dGH (161–339 ppm)–TemperamentPeacefulSemi-aggressiveCommunity tankGoodGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesRed rainbowfishGlossolepis incisusNorthern trout gudgeonMogurnda mogurnda