Yes Mike, I have, not long term though, and he flew solo. I have seen mbu do well in comm tanks, but never long term with fish as small as some of the species that you have in that tank. Are your friends keeping theirs with similar species as yours?
A buddy in town had to remove his mbu at I think 13-14", due to aggression issues, with fish that were close to his size, some much larger. I guess one never knows when individual personalities come into play.
BTW - Mbu puffers are one of my all time favorite fish in this hobby, so please don't take my comments the wrong way. You are welcome to disagree with my personal thoughts. lol