Yeah I've stopped posting breeding logs

but it's for me to decide how and when to breed certain fish, and aim for what I want to aim to. It doesn't matter if I "do something wrong" in eyes of others, everyone does their own thing their own way - whichever way they feel is best.
If I have to cull, I try culling them when they start showing certain signs of problems. Such as one fry had a bent spine, and couldn't swim very well. She/he just got fed to an aggressive fish.... I'm actually finding it harder to find a good male who'll 1. breed and 2. take care of the fry and 3. produce good fry.
How does power feeding work?? I've seen 3 month old fish look like 6 month old fish, colorful and all, but most spawns from home breeders I've seen are just getting colors, or still have stripes.