Pelvicachromis spp. are generally easy to breed, but you do need to consider a few things.
Firstly, the females initiate spawning. So you need to allow the female the chance to settle down before letting them breed. In a big tank the male and female may spread out just fine, and avoid problems. But in a small tank, anything less than 20 gallons really, it's a good idea to install the female first.
Secondly,
Pelvicachromis spp. are not pair-forming in the wild. Males have big territories within which are the smaller territories of multiple females. So both sexes stake their own claims, and that needs to be accommodated. Provide at least one suitable cave per fish, ideally with some line-of-sight obstacles between them.
Finally, the female needs to be mature and conditioned before she'll breed. Unreceptive females that don't get out of the male's way are likely to be harassed.
Once settled, these are terrific fish, and it's neat watching the female enticing the male to spawn, and then driving him away while she tends to eggs. In the case of
Pelvicachromis taeniatus, the species I bred most recently, it was a few days after hatching before the female allowed the male near the fry. Until then, he was relegated to defending the territory only.
A few other thoughts about this genus are in this article I wrote for WWM, here:
http

/www.wetwebmedia.com/fwsubwebindex/pelmatochromis.htm
Cheers, Neale