HomeCompare fishBlackfin pearlfish vs Yellowbelly gudgeon Blackfin pearlfish vs Yellowbelly gudgeon: can they live together? Verdict: Not recommendedThe Yellowbelly gudgeon is best kept in a species tank.The Blackfin pearlfish is best kept in a species tank.The Blackfin pearlfish is aggressive towards other fish.Both are comfortable at 21–24°C (70–75°F).A pH of 6.0–7.0 suits both.Side by sideBlackfin pearlfishYellowbelly gudgeonAdult size7 cm (2.8 in)4.5 cm (1.8 in)Minimum tank55 L (15 US gal)55 L (15 US gal)Temperature18–24°C (64–75°F)21–26°C (70–79°F)pH6.0–7.05.5–7.0Hardness5–12 dGH (89–214 ppm)2–5 dGH (36–89 ppm)TemperamentAggressivePeacefulCommunity tankNot suitableNot suitableCare levelModerateDifficultDietCarnivoreOmnivoreSpecies profilesBlackfin pearlfishAustrolebias nigripinnisYellowbelly gudgeonAllomogurnda nesolepis