Wayne, how big do OB's generally get?
Mine is a good 7+ inches and is a terror in my tank!
I'm about to change evrything up - and combine my mbuna from my 90 gal tank in with the haps/peacocks from my 210 gal tank - just to make it more crowded to spread out his aggression.
All my haps and peacocks except a huge Taiwan Reef are terrorized by him.
A whole lot of rocks will be added along with the mbuna, yet still leaving plenty of swimming room.
Cross your fingers for me that this works (I don't want to get rid of my bright pink monster!)
at 7" it is full grown. OB's stem from Mbuna blood rendering them more aggressive. If he is terrorizing your tank, he should be kept with larger haps over peacocks. Though a Peacock, he can and will fight
sideways