I've had cleaner shrimp and peppermint shrimp in all my reef tanks. They are pretty much reef safe (I have heard of peppermint shrimp eating zoas but its never happened to me and I have had lots over the years).
The big problem with them and you may find it too annoying to put up with, they like to steal food right out of corals mouths and they can dig down pretty deep to get it
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