Wouldn't turn down a nice frag or another fish of similar value. This guy has been in my system for about 8 months. Fully quarantined and fat/happy. He is a nipper as most dwarf angels are. Hasn't done any damage in my tank thus far but I have a lot of small frags I'm not willing to take the chance with. Meaty LPS is most at risk. He has not bothered any of my zoas/palys which is what I thought would be most at risk.