There are no reef safe effective methods for treating ich. You need to remove your fish and treat them all outside the reef, then keep the tank fishless for at least 72 days to eliminate ich.
Tank transfer method is the easiest, copper is not too bad depending on what other fish you have. hyposalinity is the only other method that works but is by far the hardest of the 3 effective methods.
Last year I tore down my reef to get my fish out, it sucked but they are back in and things are going well again. It wasn't fun but it had to be done.
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