Betta brownorum

Betta brownorum, called Brown's betta, is a small freshwater fish of the genus Betta that is native to the island of Borneo, in both Indonesia and Malaysia. It lives in peat swamps, where it is found in very shallow water. The species reaches a length of about 2.6 to 4 centimetres and has a rectangular, brick-red body. Like other bettas it is territorial, and an aquarium holding only this species needs about 20 litres of water. The fish is diurnal, builds a bubble nest, and has a labyrinth organ that lets it breathe air at the surface.