I've bred them and you simply get individual differences. Plus mood, food, water quality, dominance, parental genes, and age can make a difference. Nothing to do with F0 being nicer and nothing to do with farther from F0 being less colorful. With each spawn you'll get a few that color up early and/or have outstanding color. Given a good combination of genes in the parents some of the offspring can be even more colorful than the parents, which can also happen in other fish. Like a lot of other fish I've bred, you can get what I call 'stealth males' that can be smaller, less dominant, less colorful early, but later on turn out to be nice fish in their own right.
How red or how orange they look can also vary with food, lighting, mood, or individual. By the time you get several generations away from wild, it's going to be about the quality of your genetic line and/or the combination of genes from the parents, just like just most other fish. I've done way too much breeding of too many species from wild to various generations further down the line not to know the quality of offspring is about the quality of your stock and the genetic combinations of individual parents as much as how close to wild you are.
