HotRocks
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No way isopods survived copper. I'm not familiar with Hanna copper, but is it good for chelated copper? You might wish to try another copper test kit for chelated copper. Definitely have not reached therapeutic levels of copper if you have isopods running around.
I know nothing about isopods. I do know that his copper reading should be very accurate. I am not a coppersafe fan, but 2.0ppm is 2.0ppm for chelated copper which is .5ppm above the minimum.
Possible these are something else? Possible copper resistance?