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FYI, there is some legitimate disagreement over whether or not to use biological filtration in the form of live rock, live sand, seeded sponge filter or other means in a quarantine tank. In my case, I much prefer it because then one doesn't have to be concerned about ammonia build-up. However, the live rock/live sand causes issues if you're forced to use a copper treatment, and nothing other than bacteria on the LR will survive a hyposalinity treatment.
Nevertheless, I've managed to cure 3 fish on 3 separate occasions using hyposalinity, and the LR in the QT meant I only needed to be concerned with monitoring the specific gravity and feeding the fish. I would imagine the every 3rd day 20% or more water changes necessary to control ammonia in a 55 gallon QT would become really burdensome over a 4-6 week period.
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