Hey dad, I got a peppermint about a month ago and he has not screwed around with any of my corals, I originaly got him to see if he would kill my aptasia, but he wouldn't touch it. I also have yellow polyps and he hasn't messed with them either. The only shrimp I have had problems with is a saron shrimp, he killed most of my aptasia and started to screw with my polyps but I chased him off of them and he hasn't messed with them since.