will siamese fighting fish attack guppiesTesting kits may help examine when the tank is completed biking. This will allow time for beneficial bacteria to grow, which are a must have for breaking down toxic ammonia once fish are added to the tank. These bacteria convert fish waste into nitrates, which might be removed only with general water changes. About 10% of the water in a tank could be got rid of and changed once every week, and a gravel vacuum might be used to remove waste cloth from the substrate. Soaps and cruel chemicals should not be used to clean a tank, as these components are deadly to fish. An adult male blue Siamese fighting fish Betta splendens presented to the North Carolina State University College of Veterinary Medicine with a cranial mass discovered dorsal to his right eye.