Hello all, recently my tank came down with velvet. I am going to leave it fallow for 9 weeks. I am an idiot and didn't quarantine my fish. I will now qt my fish but I have a question. Some sites say to use a foam or sponge from the tank to use in qt tank. If I have velvet is that a good idea? I'm afraid I will transfer it to new tank. If I use copper isn't it going to destroy any beneficial bacteria anyway? Please help. Thanks