Actually, to be more detailed, from what I've read in the disease forum, FW dips can be used for temporary relief of infected fish. They would dip heavily infected fish which would get some of the ich or other organisms to drop off, but it wasn't in any means a "cure" to anything. I do not FW dip anything. I QT, observe, and if the fish shows signs of ich, I use hyposalinity treatment as per the articles in the disease forum. If it showed signs of something else, then I'd treat accordingly in QT.