HomeCompare fishMoonlight gourami vs Siamese fighting fish Moonlight gourami vs Siamese fighting fish: can they live together? Verdict: Not recommendedThe Siamese fighting fish can be semi-aggressive or nip fins.The Moonlight gourami is aggressive towards other fish.The Moonlight gourami grows about twice as long as the Siamese fighting fish; watch for bullying or predation.Both are comfortable at 25–30°C (77–86°F).A pH of 6.0–8.0 suits both.Side by sideMoonlight gouramiSiamese fighting fishAdult size13 cm (5.1 in)6.5 cm (2.6 in)Minimum tank110 L (29 US gal)20 L (5 US gal)Temperature25–30°C (77–86°F)24–30°C (75–86°F)pH6.0–8.06.0–8.0Hardness2–25 dGH (36–446 ppm)5–19 dGH (89–339 ppm)TemperamentAggressiveSemi-aggressiveCommunity tankGoodGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesMoonlight gouramiTrichogaster microlepisSiamese fighting fishBetta splendens