Peter1215....Well, you probably know more about them than I...they say they are hardy and this one seems to be...eats well, seems to prefer frozen mysis, but will also eat nori flake and pellets....I don't know if it is reef safe, I doubt it. I don't have a reef tank yet only fowlr and inverts. I do have a 4-5 inch blueface angel which doesn't bother it at all, but my butterfly is a healthy 3 inches or so...It seems to be doing fine so far. It went through a 3 week qt period, then has been in the tank a few weeks now, so its still relatively new.