I currently have a 75 gallon stocked with a male cobalt zebra (tank boss), red zebras, cobues (2 males, 4 females), yellow tail acei, yellow labs, and SRT Hongi's. There's a juvenile demasoni at a nearby store that's about 1.5inches long. The majority of my fish are 2"+ although a couple Hongi's are at the 1.5"inch mark. I know demasoni need to be kept in large groups to prevent extreme aggression between one another but I was wondering if anyone had experience keeping a single demasoni with other Mbuna? My biggest concern is that the cobalt zebra does have faint vertical bars and the Cobue is blue/orange with vertical bars as well. Would that be something I should avoid or is it worth the trial and error because I do like the looks of demasoni but don't have room for a large group of them. My tank is fairly peaceful at this point, aside from the occasional clash everyone gets along well.