Ich -x worked miracles on my tank. My green severum was in such rough shape I thought he would die. Now he is as healthy as a horse, though you should also treat for fin rot. Check if your tank is over crowded byresearcging the minimum tank size of each fish. Over crowded tanks can cause stress, which is the leading cause of ich. Treat your tanks as if ich is always present, as it probably always is. If you use salt, make sure it is compatible with the fish type you have in your tank. Lastly.l, separate any fish that may be fighting, really monitor your tank closely for signs of fighting. AQUARIUM co-op actually has a great video on YouTube about how to treat ich