HomeCompare fishDwarf rainbowfish vs Northern trout gudgeon Dwarf rainbowfish vs Northern trout gudgeon: can they live together? Verdict: Not recommendedThe Northern trout gudgeon can be semi-aggressive or nip fins.An adult Northern trout gudgeon is about 4 times the length of a Dwarf rainbowfish and may eat it.Both are comfortable at 24–26°C (75–79°F).A pH of 6.5–7.5 suits both.Side by sideDwarf rainbowfishNorthern trout gudgeonAdult size5 cm (2 in)17.5 cm (6.9 in)Minimum tank150 L (40 US gal)150 L (40 US gal)Temperature22–28°C (72–82°F)24–26°C (75–79°F)pH6.5–7.56.0–7.8Hardness8–18 dGH (143–321 ppm)–TemperamentPeacefulSemi-aggressiveCommunity tankGoodGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesDwarf rainbowfishMelanotaenia praecoxNorthern trout gudgeonMogurnda mogurnda