HomeCompare fishCrescent betta vs Northern trout gudgeon Crescent betta vs Northern trout gudgeon: can they live together? Verdict: With cautionThe Northern trout gudgeon can be semi-aggressive or nip fins.The Northern trout gudgeon grows about twice as long as the Crescent betta; watch for bullying or predation.Both are comfortable at 24–26°C (75–79°F).A pH of 6.0–7.0 suits both.Minimum tank for the pair: 150 L (40 US gal)Side by sideCrescent bettaNorthern trout gudgeonAdult size6 cm (2.4 in)17.5 cm (6.9 in)Minimum tank40 L (11 US gal)150 L (40 US gal)Temperature24–30°C (75–86°F)24–26°C (75–79°F)pH6.0–7.06.0–7.8Hardness5–19 dGH (89–339 ppm)–TemperamentPeacefulSemi-aggressiveCommunity tankGoodGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesCrescent bettaBetta imbellisNorthern trout gudgeonMogurnda mogurnda