[pogodzib]

Copper in a reef tank is never good. It will set sucked up by your live rock and tank silicone and can take a very long time to get out. Usually, when people get copper in a reef tank, they need to end up tossing the rock in they want to keep corals or inverts. First off, do you know how the copper got into your tank (Tap water, chemical treatment, etc...) and have you checked for copper using a different brand of test kit to verify that you really have copper in your tank?

The first thing I would do would be to put a polyfilter in your tank and replace it on a weekly basis of at least a month or two and possibly add some CupriSorb