Have you already added the copper? If not, don't. If you have...heres my story.....
I added copper to the main tank. It killed my inverts and my tang. Other fish..damsels...still alive. But...in order to get rid of the copper, I 'raked' the cc..(I know..cc bad.) everyday, twice a day, changed the filter cartridges every couple days, and did 25% water changes every other day for two weeks. A lot of work, yes......way to much work, that's why I say don't do it. Got my live rock after all of this, and more inverts. Copper reads 0, and I test OFTEN, and everything is doing fine. It is just such a huge pain in the behind it's not worth it....at all. So if you haven't, don't. There are better ways and better products.
If you have already added the copper, start your water changes and if you have a tang......get him out of there asap or the poor thing will get ugly ulcer like things....just to name a few, and croak.
The only thing I can say about ALL of my mistakes, and there are enough of them to write a book, that at least people can learn from experiece....mine to be exact.