HomeCompare fishBlackfin pearlfish vs Banded rainbowfish Blackfin pearlfish vs Banded 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.The Banded rainbowfish grows about twice as long as the Blackfin pearlfish; watch for bullying or predation.Both are comfortable at 18–22°C (64–72°F).A pH of 6.5–7.0 suits both.Side by sideBlackfin pearlfishBanded rainbowfishAdult size7 cm (2.8 in)14 cm (5.5 in)Minimum tank55 L (15 US gal)210 L (55 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 nigripinnisBanded rainbowfishMelanotaenia trifasciata