I have a 24" mbu in with a lot of other fish (check my signature). I have had no problem with the mbu going after any of the other fish I keep. He is in a 900 gallon tank so he has planty of space and I keep him well fed too. I got him from another member on this site that did have problems with the mbu biteing the tails off his rays but left all of his other fish alone as well.
