Weird!
I had not had much luck with peppermint shrimps and won't keep them anymore for fear of them eating LPS. I also quit the regular cleaner shrimp because they take the food from my sun corals and it's just too much trouble to stay there chasing them off with a stick until the suns are done eating.
Right now I only keep the anemone shrimp and am happy with them. They are also called 'cleaner shrimp' but not sure if they are really related?

Glad you got it out!