About 2 weeks ago my tank had a bad case of ich. I lost a couple of fish but was able to save my black spotted grouper. When i first put him into a qt tank he could only move one flipper and swam sideways.. He has since improved greatly. He swims normal now and is eating well agian. The problem now is he has faded splotches all over him. Is there something else wrong with him? I have been treating him with formalin and zinch free malchie green. Ive been doing 50% water changes every other day because of the lack of a decent filtration. I really want to make sure he is not getting sick with something else.