Large-mouthed betta

Betta macrostoma is a labyrinth fish endemic to Borneo. It is distinguished by its particularly large mouth and developed fins. Males are very colorful with red, blue, and green hues. It lives in acidic blackwater of peat swamps. In the aquarium, it requires very soft, acidic water, low light, and plenty of hiding places. It is territorial but less aggressive than Betta splendens.