If it's Ick you are trying to get rid of then why not try hyposalinity first ? ... give the fish a freshwater bath then put in the QT tank and slowly drop the salinity to 1.009 ( over a few days ) and leave it there for 4 - 5 weeks ... then slowly raise the salinity back to 1.026 ( or whatever is normal in your tank ) ... Saltwater Ick cannot survive low salinity ... your display tank will be without any hosts ( fish ) so whatever ick was left behind will die in there also.
Cheers
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Steve
“The most important decision you make is to be in a good mood.”
― Voltaire
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