HomeCompare fishGlowlight tetra vs Northern trout gudgeon Glowlight tetra 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 Glowlight tetra and may eat it.Both are comfortable at 24–26°C (75–79°F).A pH of 6.0–7.8 suits both.Side by sideGlowlight tetraNorthern trout gudgeonAdult size5 cm (2 in)17.5 cm (6.9 in)Minimum tank40 L (11 US gal)150 L (40 US gal)Temperature24–28°C (75–82°F)24–26°C (75–79°F)pH6.0–8.06.0–7.8Hardness5–12 dGH (89–214 ppm)–TemperamentPeacefulSemi-aggressiveCommunity tankExcellentGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesGlowlight tetraHemigrammus erythrozonusNorthern trout gudgeonMogurnda mogurnda