With Pelvicachromis and SA Apistogramma, the broodcare is very tight. When the parents are ready to spawn again, they shoo the juvies away, usually at about 4 weeks. But if the tank isn't large, the juvies can't leave. The adults then consider them to be fry predators in waiting, and rapidly kill them. I have mistimed broods of 40, and had them wiped out in one night.
I have had fry grow to adulthood with the parents in one metre, 210 litre plant jungle tanks, but never in anything smaller. My sample size for learning this has been 15-20 different pairs from different Pelvicachromis mostly breeding from 1 to 8 times each, and I don't know how many Apistogramma. There's a fine line. You want them exposed to parental care, but unless your tank is huge, you can leave it too long.
There was a hobbyist, but serious hobbyist experiment done 30 years ago that suggested 26 degrees from pre-spawning a month gave you the best shot at an even sex ratio. P. subocellatus is notorious for single sex broods. I only bred them a few times, and always had a lot of females.