No proble. I believe that the only case where iodine can be depleted is in a reef system, but even there im not sure. There is plenty of iodine in the salt mix, and if you feed the mantis crustaceans, frozen or live, it will get all the iodine it needs. There is absolutely no need to add iodine in my mind. If you're worried about depletion over time, I wouldn't so long as you do your regular water changes.
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