Ok, I need some help with her. This is her fourth night in the tank and she is freaking out. One of the tangs broke out with Ich. I removed her and put her in a quaratine tank and am treating her with formalin. The other fish in the tank including the shark looked fine and were doing well breathing fine and everything. Tonight when I was feeding her I noticed that she was breathing really fast 40~50 gill movements per minute, she seemed irritated, sucking in sand, and she did one barel roll into the sand. I'm thinking that the whole tank is infected and I put Formalin and Melachite in the tank. What else do I need to do, I don't want to loose her