Randy Holmes-Farley
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FWIW, a copper test kit cannot accurately test low enough to say water is OK for a reef tank. They are intended for monitored medication levels when treating fish.
If you detect any with a kit in a reef tank, it is too much, but detecting none is not an assurance of being OK.
If you detect any with a kit in a reef tank, it is too much, but detecting none is not an assurance of being OK.