This morning when I looked in my tank, I thought "Wow, that Caulastrea sure has some big sweeper tentacles." When the lights came on though, I saw those tentalces were actually antannae and legs. I'm also missing one peppermint shrimp.
I'd bet your peppermint will show up again. That looks like a molt.
LPS are fun because of the sweepers and feeders. Mine eat algae when I go through and pick it out. The floaters always find their way to an Acan or Favites, etc. They earn their keep.
I agree it looks like a molt to me. If your shrimp just molted, it will be hiding for a while until it's new exoskeleton hardens up a bit. They are very soft and vulnerable right after they molt.
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