Oh boy I can tell you are a Mbuna fan! I love those guys too, and we have several Yellow Labs in our tanks and 30+ Lab fry growing out right now. But... I have to be honest with you :( Get ready for a challenge and it may not hurt to have a spare tank or two ready for a time out tank to keep fatalities to a minimum.
Mbuna's are very aggressive, I am not saying it can't be done but do your research thoroughly before purchasing your stock. I am not qualified to help you with that because I gave up on trying to accomplish this task, even after racking my brain with extensive research.
One of the main problems I had is with most Mbuna, males and females look alike. You will not know what is what until you start seeing breeding behavior. Our Lab that just had fry looks like a male all day long, egg spots, very black top fin, pelvic fins and black slant in eyes.
I hate to say this, but our Mbuna tank was a disaster for us. For starters, they are landscape artists and will re-arrange your entire tank sifting sand and creating bare spots clear to the glass. In our case, this caused rockscape to topple over and scratch the glass, thankfully no fish were injured in the process. (this was despite the fact that I knew they were going to do this and carefully arranged the rocks to minimize disaster)
Next, once they get big enough to display breeding behavior, which in our case was about 2 to 3", watch out because that is when the real chase is on. Everybody is trying to find their breeding spot and entice the females. At least at this point you can start to determine the males from the females. The males will chase the other males away from "their honey hole" relentlessly and dig dig dig so much so that they don't care about eating. Dig dig dig all day long, that's your males. At this point the females are just trying to hide. Whenever a female gets close to a male, he will shimmy dance and look like he is having a serious seizure. Males will want to breed with any female in the tank, they are not picky as far as species. When you see this, the one not dancing is probably a female. This is when I started pulling out females and moving them to the time out tank.
If you are not home all day... you may not see the males fighting over the females and come home to find a dead fish and wonder what happened. It appears that having unidentified females in the tank causes this ruckus. This is when I attempted to pull out the most aggressive males into another tank with no females, just to keep the rest of the fish in the tank alive until I could figure out what was going on next.
The Demasoni never got large enough to cause much of a problem, but they were constant fin nippers. They were re-homed first.
I threw in the towel after all this hard work and 3 dead fish. Re-homed all of our Mbuna, except for the Labs.
You will need all of the expert advice you can get, but not from me. I tried my best, and failed. You will also need a couple extra tanks. That is why we moved on to all male haps and peacocks, at least with these fish you have a better chance of getting a male. I am only aware of one peacock where the female is just as colorful as the male and that is our F1 Aulonocara jacobfreibergi caroline "Swallowtail". Even with haps and peacocks you will have aggression with all males in the tank "i.e. jacobfreibergi hate each other" and will have to adjust according to what's going on in your tank. But, thankfully we have finally successfully accomplished a good mix now and the Boyz are getting along.
Stress in fish is the number 1 factor that leads to death by bullying and death from disease that multiplies when the fish's immune system is weakened because of stress. Some of our fish have died because of both reasons, despite my earnest attempt to keep them as healthy and safe as possible.
Go get em' tiger!!! If that is what you want, I truly admire you and wish you all the best. It can be done, I have seen it work in other people's tanks, I just didn't have whatever it takes to be successful with it. :)
Here's a link to the Screamo tank. This Red Zebra
was the most aggressive guy we had and had to re-home him carefully. This tank set up was after the other fish had been re-homed and rocks were removed and replaced with a resin wood piece to minimize damage to fish and the inside glass of the tank. The tank water was always cloudy because of sand being moved around. I even tried using part sand and part small pebble substrate to give the large rock decorations something more substantial to sit on. That did not work either and eventually all of the sand got mixed in with all of the rock substrate creating a huge mess. Have you changed your mind yet??? (There are 4-5 pics in this album, I think you will be able to see all of them. Feel free to browse around my photobucket collection if you want to :))