I'd say yes, once anything has been exposed to copper it's virtually useless in a reef tank. A fish only tank maybe but no live rock etc. Even with conditioners that bind heavy metals copper will still be present to some extent. Silicone on an aquarium, plastic on a power head or pump etc...anything that has been exposed should be avoided. Good news is, it will probably be perfect for a QT tank for fish :-)
Doug
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