I would research how each of your fish will respond to copper if you decide to use this method. Some fish can not handle it and it will kill them. I had an outbreak a few months ago, set up a hospital tank and stressed the fish moving them over, lost my 2 clowns within hours. Out of 7 fish that went into the hospital, 2 made it back in the DT, 1 ended up with a fungus and died within a week. I made the decision not to qt anymore fish and slowly restocked my tank. One of the last fish I added came with ich. I have been adding selcon and garlic to their food and they are all fine. I panicked when I realized the fish had it again, there's one fish that still has visible signs of a couple of spots, otherwise the others are fine, no flashing.
Good luck, I hope they all pull through regardless of what you decide.
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