I'm not an expert in fish disease treatment, tmz, but there are a lot of knowledgable people in the Disease Forum that might provide the definitive info about Tangs and Copper you are looking for.
I recently dealt with an Ich infected tang that I moved into QT and followed all the prescribed hypo/copper/formalin treatments and it died in 3 days.
The next one I got developed some white spots after introducing it to the tank but this time I just left it in and gave it a good diet of garlic and Selcon soaked PE Mysis and Spirulina pellets. Much to my surprise, all signs disappeared within about a week and none of the other fish became infected. It's now a beautiful, plump fish with deep color and flawless skin that looks like satin.
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