I agree, it is
Pelmatochromis buettikoferi. I picked up some myself at OCA from a guy who was selling breeding age youngsters out of his room. I had a pair form out of the five I kept, and I gave 5 to a friend, who has also had a pair form and spawn. I've heard a lot of people talk about how aggressive they are, but mine have only been moderately so when spawning. Sexual characteristics are not extreme, and require close observation to determine.
Here's a shot of my male when I first got him, fins are rough because the
salvini in the tank took a slight dislike to him. (Sal went bye-bye for being a wife killer.)

- Pelmatochromis buttikoferi 02.JPG (181.96 KiB) Viewed 2135 times
Here's the pair just before they spawned, female left and below.
If you can't Dazzle them with your Brilliance, then try to Baffle them with your BullS***!