um, well i disagree with managuense alot as far as demasoni go, demasoni should be kept only in groups of 12 or more (like tropheus) do to their extreme agressiveness toward conspecifics, i have seen a group of 6 demasoni that onyl lasted a week at which point there was only 1 left, in small groups the agression is targeted on a small few so the abuse is much worse, brichardi spawn in pairs, they are agressive when breeding to anything else in the tank, brichardi are not harem brooders as said above, they form pairs for life and will attack any others, pictures or descriptions would be great help in identifying your fish, if they came from an assorted african tank then they are most likely mbunas, they will need a 55gallon or large fairly soon depending on water quality, temp and what you feed, also be sure not to feed high protein foods, i feed mine spirulina flakes, 1/2 veggie 1/2 spirulina flakes, and once a week one feeding of brine shrimp