Hard to say from the photo, but I would have to say from what i can see, it appears to be Nimbochromis livingstonii. A better shot of the fish in question might help considerably.
There is a venestus in the Photo (center right) but i dont believe that was one of the fish being questioned. I believe the other Livingstonii is obscured by another fish, or the MFK logo imprinted on the photo.The top one appears to be a livingstonii, as suggested, but the second one near the bottom looks like a venustus to me.