i have seen those in one of my tanks before too. I assume it was an isopod, not sure where it came from, but what i noticed is that they were only on the underside of my acro frags. i couldnt find an ID on them, however when scanning across dozens of pictures of acro pests I noticed something that looked very similar to them.
As a recommendation, I would dip all of the SPS frags in either revive or pro coral cure.
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