In my experience, Nimbochromis venestus (giraffe hap) are more of an open water Malawi Cichlid, They are generally more peaceable in nature and will occupy the mid to upper range of the tank. Venestus are also a much more active and personable fish and will will bring out a more active nature of its other tankmates. Unless you plan to breed the fish, I would recommend a few more Labidochromis caeruleus (electric yellow labs) and a few venestus. you can also add other more peacable peacocks as they as well will peacably co-exist with the Nimbochromis venestus and Labidochromis caeruleus. Should you decide to go this route, you may wish to establish a grow out tank in the event you find one of your Labidochromis caeruleus females holding, as the fry will have little chance against the voracious appetite of the larger Nimbochromis venestus.
FYI
Nimbochromis venestus are ambush hunters, their splotchy pattern is meant to resemble that of a decaying fish. The Nimbochromis venestus will lay on its side, motionless at the floor of the tank, and when possible, partially buried in the substrate in efforts to mimic a corpse. They will lay in wait until unsuspecting fry approach seeking to forage meat from the corpse. This unique hunting method is one that is shared by the Venestus' sister species the Nimbochromis Livingstonii.