HomeCompare fishSlim betta vs Butterfly splitfin Slim betta vs Butterfly splitfin: can they live together? Verdict: With cautionThe Slim betta can be semi-aggressive or nip fins.Both are comfortable at 26–30°C (79–86°F).A pH of 6.5–7.5 suits both.Minimum tank for the pair: 75 L (20 US gal)Side by sideSlim bettaButterfly splitfinAdult size10 cm (3.9 in)8 cm (3.1 in)Minimum tank75 L (20 US gal)75 L (20 US gal)Temperature24–30°C (75–86°F)26–32°C (79–90°F)pH6.5–7.56.0–8.0Hardness5–15 dGH (89–268 ppm)9–19 dGH (161–339 ppm)TemperamentSemi-aggressivePeacefulCommunity tankGoodGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesSlim bettaBetta bellicaButterfly splitfinAmeca splendens