As with many fish, what they will pick on is based on the individual animal. In my experience, the coral beauty is most likely to pick on LPS and clams, but individuals have been known to nip at softs and other coral. It is really hit and miss on what your individual fish will pick on. I have one that leaves everything alone, but I traded another one that wouldn't leave my sea fans alone. Doing several intervals of feeding throughout the day sometimes cuts back on the nipping, but is no guarantee these fish will stop nipping once they start.