To answer your questions a little further. I would add rock sand and some water from your tank to the quaratine.
I treated my fish with Hypo a few months ago and although I lost a lion fish I still consider it a success. I have been ick free ever since.
I have never treated with copper so I can't comment.
Some fish handle treatment with hypo or copper better than others so I hope someone can give you more specific advice.
Sorry I wasn't more help
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