You will need a tank with a ability of 40 litres for one Siamese combating fish and a college of small group fish, with an extra 20 litres counseled for a big shoal or each extra small shoal of an alternative species. Increased plant cover is also suggested to attenuate stress by providing separate territories and hiding places. A backup tank might be accessible in case the Siamese combating fish becomes aggressive or the extra fish start to nip or harass the Siamese combating fish, which could often occur with male fish that possess long finnage. Community fish which swim at a special strata to the Siamese combating fish similar to the mid to lower tank levels are preferred as Siamese fighting fish often claim the higher sections of the tank. The Siamese fighting fish Betta splendens, commonly called the betta, is a popular fish in the aquarium trade. Bettas are a member of the gourami family and are known to be highly territorial.