siamese fighting fish is dyingIn temperate areas they are not appropriate for combating fish in winter unless they may be able to be kept in a place which does not get cold. Many of these tanks are too small to put a standard aquarium heater in. BreathingFighting fish are anabantids. They and their spouse and children can breathe air as well as water. This means that they can live in much smaller aquariums than most fish. In the wild they from time to time live or even breed in very small bodies of water adding the water filled hoof prints of a water buffalo.