I have three mbuna in a 55 gal. Ive been noticing one of them "brushing" its side against the gravel. The next day, i noticed another one doing the same thing. this is a case of ich right? spreading around to my other fish. anyways i dont have any carbon in my filter so would it still be okay to treat my tank with commercial medication? what about the other fish that doesnt seem to have the disease yet... will it be affected in any way by the medication? i dont have a quarentine tank yet, gonna get one soon hopefully, but dont want the disease to get worse.