Chelated copper is safer. I've had success using copper with wrasses. Just bring the copper level up gradually and they handle it just fine.
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I don't think wrasses do well in copper.
Also, when I introduce them in a month, should I use a social acclimation box for them? I have 2 ocellaris, a yellow tang and a genicanthus Watanabe. How many can I put in a time in the elite aquatics box?