siamese fighting fish for sale canberra069. The usual way of heating the tank is with an aquarium heater. A 50w heater is appropriate for a small Aquarium. If you have a room that never gets cold then the Fighting Fish can be kept there without an aquarium heater. A room that is simply heated by the sun will get cold when the sun is not shining. This is not appropriate. , elephant ear and double tail, figs. 3Aand 4A were studied. Before establishing mapping families by crossing parents with different phenotypes, test crosses were generated to observe phenotypic segregation of double tail, albino, and dorsal fin spotting. Parents that were homozygous for the 2 studied traits i. e. , double tail vs.