the other day i noticed that my pacu and like 7 other S.A. fish have spots all over them. I thought it was air bubbles at first but i definately think they are all sick and have ick. It's a 55 gal. tank. What should I do? I did a 30% water change last night but it doesn't look like they have gotten better. Im open with ideas. Please help me find a way to keep my fish alive. Thanks.