I would have to respectfully disagree. I've had great success with them, but in 2 tanks; I have had evil evil peppermints, and NO they weren't camel shrimp.
I bought a few of them for some aiptasia in my old 50g breeder, and literally the second I dropped them in; one of them went straight to my acans and started ripping then to shreds. It was horrible and I can assure you that my acans were very healthy, and another time, on a completely different tank; it was pretty much the same situation; I bought a few peps, but after dropping then in; one went straight to my rbta and ripped it in half right in front of me.
I have heard rumors that it seems to be the wild caught peppermints that are so ruthless, and that the tank raised peppermints are raised on eating nothing but Aiptasia, but it's all a big risk IMO.