I tried peppermint shrimp a few times. You have to make sure to get the right species of them. I had a few that worked well until my wrasse ate them all. I got another batch later on and put them in an acclimation box with some rocks/frags that had aptasia. They are those over night but when I released them into the tank they completely ignored any aptasia. Figures.I bought 4 a few days ago and all they seem to do is hang out my the top of the corner flow. I have yet to see them really move around the tank