Duncans are LPS
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As far as I know, real peppermints usually don't, but there are some problematic look-alikes that tend to be sold under the same name.I never know peppermints could do such work.
If it happens again after the shrimp is gone, I would recommend covering a flashlight with something red (they don't see red light as well as other colors) and using that to check your tank a few hours after lights-out for a few days to make sure you don't have something hiding in your live rock that is the night-munching culprit.That is exactly what I will do. I will get a another LPS or two this week and take the shrimp to the Lfs.and I will post on here. Thanks for all the help everyone.