HomeCompare fishGreen pufferfish vs Northern trout gudgeon Green pufferfish 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 24–26°C (75–79°F).A pH of 7.5–7.8 suits both.Minimum tank for the pair: 190 L (50 US gal)Side by sideGreen pufferfishNorthern trout gudgeonAdult size20 cm (7.9 in)17.5 cm (6.9 in)Minimum tank190 L (50 US gal)150 L (40 US gal)Temperature24–28°C (75–82°F)24–26°C (75–79°F)pH7.5–8.46.0–7.8Temperament–Semi-aggressiveCommunity tank–GoodCare level–EasyDiet–OmnivoreSpecies profilesGreen pufferfishTetraodon fluviatilisNorthern trout gudgeonMogurnda mogurnda