So you want to keep discus fish or are already keeping discus fish. One of things you must do is keep your discus fish healthy and disease free. In this article I’m going to give you a few tips on how to keep discus fish disease free as:One of the most common assumptions with discus is that they easily get disease and die. This is not true. They will only get disease if you mistreat them.The root of the problem is stress, if you cause discus stress there immune system will lower and make them ve.