Pelvicachromis sp. are not mouthbrooders. They are substrate spawners, typically laying the eggs on the roof of their cave. The eggs hatch after 2-3 days, the fry aren't swimming until another 3-4 days after which both mother and father will lead them around the tank to search for food, constantly twitching to signal their fry and corralling their fry in numerous pits they will dig around the tank. Their pits are not deep so they don't ruin planted tanks but they do become very protective of their fry while caring for them and consequently quite aggressive. In a community setting the fry usually get eaten. In the pair only setting, that should be a minimum of 20 gallons, the pair will grow their fry to about 1/2" when they decide to start on a new batch. If not removed older fry will pick off new fry and parents may target older fry as threats to their new fry.
These are some pix of my kribs. They're lots of fun!