So I added a powder blue tang and it died from ich two days later. i never had any problems with it before so im assuming it came on her, anyways i wait a couple weeks and have added a clown and a jewel damsel and they have both got it and I kept them alive with garlic now they are ok. So heres my question is ich just free floating right now if they have already dropped off my fish? If so should I get a uv sterlizer. I feel restricted on adding anymore fish because I know its in there. I know I should of QT but here I am its in my DT now what?