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Unfortunately, you won't be able to effectively treat a fish for "Ich" with copper in a pail for a number of reasons.
1) Tangs are quite sensitive to copper. If you must use copper, use something like Seachem's Cupramine.
2) Copper treatment must be continued for at least 14 days, although 21 days will be better. You will have a lot of difficulties keeping a fish for that long in a pail with no biological filtration.
3) Care must be taken to maintain the correct copper level for the full term of the treatment. If it gets too low, it won't kill the parasites. If it gets too high, it will kill the fish.
I have already recommended hyposalinity which is not only effective for the treatment of "Ich", but is much safer on the fish. To do this - or copper treatment - you will need to set up another treatment tank.
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ATJ
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