I read on the page that gobies can tolerate copper, but levels should remain low. Is .15 low enough?

Lower than that will not kill the ick. Please help me! For starters, make certain you have the right copper test for the copper you are using.

Most copper tests test for copper ion concentration, which will not work correctly on a chelated copper solution. You may in fact have a higher level of copper than the test indicates if you are using the wrong test. I suggest you get your ammonia and nitrite tests ready and be prepared to deal with the accumulation of nitrogenous wastes.

Copper does not discriminate and will kill your biological filter and any life on live rock you may have. As a result, your water quality will take a nose dive so you'll need to have ready several days of water changes and begin executing about 25% every other day, perhaps more. After each water change, you'll need to test for copper again to make sure ... more.

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