HomeCompare fishCrescent betta vs Roundtail paradisefish Crescent betta vs Roundtail paradisefish: can they live together? Verdict: With cautionThe Roundtail paradisefish can be semi-aggressive or nip fins.Both are comfortable at 24–26°C (75–79°F).A pH of 6.0–7.0 suits both.Minimum tank for the pair: 115 L (30 US gal)Side by sideCrescent bettaRoundtail paradisefishAdult size6 cm (2.4 in)7 cm (2.8 in)Minimum tank40 L (11 US gal)115 L (30 US gal)Temperature24–30°C (75–86°F)16–26°C (61–79°F)pH6.0–7.06.0–8.0Hardness5–19 dGH (89–339 ppm)5–19 dGH (89–339 ppm)TemperamentPeacefulSemi-aggressiveCommunity tankGood–Care levelEasyEasyDietOmnivoreCarnivoreSpecies profilesCrescent bettaBetta imbellisRoundtail paradisefishMacropodus opercularis