If copper gets into your tank, it will probably make your expensive LR into useless boulders. If you then use the rocks in a new tank, the copper would probably leach out & kill that tank as well. Copper in a medication tank may be of some use in certain situations but Copper in a main display tank is extremely bad news. Just ask the Vancouver Aquarium. In the late 70s or early 80s, someone accidentally dosed their system with copper sulphate & wiped out thousands of fish. It has never been the same since, although lately it is becoming worth visiting again. In glass tanks, copper may impregnate your silicone (from what I've read & heard, but I've never tested this myself).
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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