. . . "Once you have sorted out that out, you should add a bit more variety to his diet such as different types of vegetables and fruits (lettuce, spinach, broccoli, pears, strawberries, etc), frozen or dried live foods (blood worms, brine shrimp, etc) and other fish you can get such as I fed my fish algae wafers intended for bottom dwelling fish and they both love them I bet water quality is your problem" .