HomeCompare fishBloodfin tetra vs Northern trout gudgeon Bloodfin 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 3 times the length of a Bloodfin 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 sideBloodfin tetraNorthern trout gudgeonAdult size5.5 cm (2.2 in)17.5 cm (6.9 in)Minimum tank75 L (20 US gal)150 L (40 US gal)Temperature18–28°C (64–82°F)24–26°C (75–79°F)pH6.0–8.06.0–7.8Hardness10–30 dGH (178–535 ppm)–TemperamentPeacefulSemi-aggressiveCommunity tankExcellentGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesBloodfin tetraAphyocharax anisitsiNorthern trout gudgeonMogurnda mogurnda