Yes I knew a guy a few years ago who purchased tank from someone who had repeatedly used copper in their tank (even the siicone tested positive for copper). Buying a test kit will defn work, maybe isolate some of the live rock and test it was well (if the water you use before it goes in the tank test negative for copper, and the water in the tank tests positive).
If the live rock has some kind of copper contimaination...well then..that would be up to your friend.
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