Either one is at risk to nip. Yes some will say theirs did not but their are some that will say they do. The question is are you willing to tear the tank up to get them if they do start nipping. Yes they make traps for fish but your corals dont have time to wait for you to catch them. I lost two corals to angels while I was waiting to catch them finally I had to go after them and remove everything. These are things you must think about before you put angels in a reef tank.