HomeCompare fishHarlequin rasbora vs Arulius barb Harlequin rasbora vs Arulius barb: can they live together? Verdict: Not recommendedAn adult Arulius barb is about 3 times the length of a Harlequin rasbora and may eat it.Both are comfortable at 22–25°C (72–77°F).A pH of 6.0–7.0 suits both.Side by sideHarlequin rasboraArulius barbAdult size4 cm (1.6 in)12 cm (4.7 in)Minimum tank55 L (15 US gal)210 L (55 US gal)Temperature22–25°C (72–77°F)19–25°C (66–77°F)pH5.0–7.06.0–8.0Hardness5–12 dGH (89–214 ppm)2–10 dGH (36–178 ppm)TemperamentPeacefulPeacefulCommunity tankExcellentGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesHarlequin rasboraTrigonostigma heteromorphaArulius barbPuntius arulius