So I'm setting up a couple of QT tanks as it appears some of my fish have started getting ICK (figures seeing I just took my UV Sterilizer off line last month). Anyways, I was planning on taking a rock or 2 out of my sump to help seed the QT tanks. However, I seem to remember reading before that rock will just soak up the copper and make it usueless in QT. Any truth in that? If so, what would one recommend to seeding my QT tank with beneficial bacteria while i QT my fish.