Fishes that are in compound tank have softer skin and their scales are not smooth enough to lolerate hard hitting from a sharp teeth opponent. They need to be kept individually in a jar or bottle for conditioning about a week . Put half an Indian leaf or some dried banana leaves in the container. The Indian leaf or banana leaf will harden the skin and scales . During this one week in the container, just feed them once every two days with any kind of food such as pellet food or live food such as worm, mosquito lavae, atemia, moina or any live food. Live food is preferable since there is less fat than pellet food. Keep the fish in container without seeing each other. After a week fish will lost their fat, skin are stronger scales are harder and they look more shining than before conditioning. If there is no time to do the training or lack of opponent, the fish can be kept in the conditioning container for another 2-3 weeks without harming anything. No water change is required during this conditioning, for up to 4 weeks.