Don't know- but the undulated has to one of the meanest fish available. I had one many years ago and it was intolerant of any other fish. It would just go bite them and chew them up piece by piece no matter the size of the other fish (and took a piece out of my thumb once!). Really cool looking fish, but brutal. I hope you aren't intending them to go in the 180 reef you list in your sig, I think they will sample most any coral. If you already have one in your reef, then I wonder if I just had a psycho individual.