HomeCompare fishPearl danio vs Arulius barb Pearl danio vs Arulius barb: can they live together? Verdict: With cautionThe Arulius barb grows about twice as long as the Pearl danio; watch for bullying or predation.Both are comfortable at 20–25°C (68–77°F).A pH of 6.0–8.0 suits both.Minimum tank for the pair: 210 L (55 US gal)Side by sidePearl danioArulius barbAdult size5 cm (2 in)12 cm (4.7 in)Minimum tank75 L (20 US gal)210 L (55 US gal)Temperature20–25°C (68–77°F)19–25°C (66–77°F)pH6.0–8.06.0–8.0Hardness5–19 dGH (89–339 ppm)2–10 dGH (36–178 ppm)TemperamentPeacefulPeacefulCommunity tankExcellentGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesPearl danioDanio albolineatusArulius barbPuntius arulius