HomeCompare fishSiamese fighting fish vs Roundtail paradisefish Siamese fighting fish vs Roundtail paradisefish: can they live together? Verdict: With cautionThe Roundtail paradisefish can be semi-aggressive or nip fins.The Siamese fighting fish can be semi-aggressive or nip fins.Both are comfortable at 24–26°C (75–79°F).A pH of 6.0–8.0 suits both.Minimum tank for the pair: 115 L (30 US gal)Side by sideSiamese fighting fishRoundtail paradisefishAdult size6.5 cm (2.6 in)7 cm (2.8 in)Minimum tank20 L (5 US gal)115 L (30 US gal)Temperature24–30°C (75–86°F)16–26°C (61–79°F)pH6.0–8.06.0–8.0Hardness5–19 dGH (89–339 ppm)5–19 dGH (89–339 ppm)TemperamentSemi-aggressiveSemi-aggressiveCommunity tankGood–Care levelEasyEasyDietOmnivoreCarnivoreSpecies profilesSiamese fighting fishBetta splendensRoundtail paradisefishMacropodus opercularis