Absolutely, however our systems aren't outfitted with UV. they would require a good deal of replumbing to fit them in. Bleach is the way we went. We have 6 750 gallons and 3 240's. I will be doing one at a time since we are in no rushWouldn't running a UV eliminate heterotrophic bacteria in your QTs? Of course, it would also remove the CP but should leave the bio-filter intact. Perhaps something to do in-between batches of fish. Otherwise, I'm assuming the only way to counteract this problem is to break down the QT after CP treatment or in your case with a large QT, sterilize it with bleach.