HomeCompare fishBlackfin pearlfish vs Murray river rainbowfish Blackfin pearlfish vs Murray river rainbowfish: can they live together? Verdict: Not recommendedThe Blackfin pearlfish is best kept in a species tank.The Blackfin pearlfish is aggressive towards other fish.Both are comfortable at 18–22°C (64–72°F).A pH of 6.5–7.0 suits both.Side by sideBlackfin pearlfishMurray river rainbowfishAdult size7 cm (2.8 in)9 cm (3.5 in)Minimum tank55 L (15 US gal)150 L (40 US gal)Temperature18–24°C (64–75°F)18–22°C (64–72°F)pH6.0–7.06.5–7.2Hardness5–12 dGH (89–214 ppm)–TemperamentAggressivePeacefulCommunity tankNot suitableWith cautionCare levelModerateEasyDietCarnivoreOmnivoreSpecies profilesBlackfin pearlfishAustrolebias nigripinnisMurray river rainbowfishMelanotaenia fluviatilis