I had my two MBUs in with rays, etc. I was nervous with the big guy but not the smaller one. Every MBU is going to be different but you have to suspect that every MBU out there is going to bite another fish at some point, I just doesnt happen that they dont, I have yet to see it with the 5 I have owned. My big guy biy my rays several times, my little guy took the longest before he bit someone, I forget the fish he bit but he also bit my ex while she was reviving a pbass, guess he thought her finger was a piece of shrimp and he was only 12" or so, now if that was other one at 24", I think her finger wouldnt have looked the same.
If I was you, I wouldnt, even at smaller sizes there chompers are HUGE. Eventually all my MBU's got their own tank.
Here are some of my past MBUs
[video=youtube;RjIdGJaaBuE]http://www.youtube.com/watch?v=RjIdGJaaBuE[/video]
Wo
I have many more videos in my channel if you want to take a look.