They and their spouse and children can breathe air as well as water. This implies that they could live in much smaller aquariums than most fish. In the wild they sometimes live and even breed in very small bodies of water including the water filled hoof prints of a water buffalo. They are sometimes also found in rice fields. They wish to be in a position to get to the floor or they could drown. Although they can be kept in very small containers this is not an easy way.