My advice is different as I would say no, anytime I ve seen it done the fronts are nipped at and get picked on (yes I ve seen small mbuna go at a full grown front) and the ones i see always look very stressed out. I even just recently tried to introduce a mbuna I have that I was gonna try to sell.... just to give him more space untill I sell him.. needless to say he chased all 12 of my fronts and shreaded the fins on the large one in which its half the size of, so I removed him. I did keep a few peacocks at one point in time with my fronts... it wasnt toooo bad but they did tend to nip the fins of the fronts. Its really up to you and if you want to give it a try. If you really just want to keep tank mates with them I would look into rock dwellers and open dwellers from lake tang... I ve kept different varaties with my fronts with great success. I know I ve seen people do it and seems to be ok... but ime and from what I have personally seen... it doesnt work out and the fronts tend to be stressed.