I just happened to catch these two guys in the process of mating. I actually noticed it when Piggy, a larger, female Copadichromis borleyi rolled in and ate the freshly fertilized eggs before the female Aulonocara had a chance to scoop them up. Piggy would watch, wait until she laid one and then just push them out of the way and eat the egg(s). When I noticed this I started feeding the tank to distract any predatory behavior.
Phantom (the male) and his mate circling the spawning rock