Its a crap shoot really, because some pick on sps, some pick on lps, some pick on zoas, and some only pick on rocks. Mine never touched lps or zoas but always nipped at sps, he even got one of my yellow tangs to start picking at sps polyps after seeing him do it so often. I have a large sps tank so it doesnt bother me too much as they never do much harm but I would rather they didnt do it at all. Every fish is different and you will be taking a chance putting one in your mixed reef for sure. The question is, are you ready to deal with it if it does pick at stuff?