Exactly so.
Every fader carries the orginal unfaded genotype, however the fader gene overpowers the gene for normal coloration because-as we've already went over- it's a dominant gene. So you could use Fn for the fader parent, F for fader, n for normal, then use nn for the normal parent. I've never tried to extrapolate beyond a simple cross such as the op's citrinellus x carpintis...I'm not sure it would work once you start getting into more complicated hybrids involving several species.
Remember, the fader gene is genetically incompatible with many species, also remember most examples of punnets are usually using two species from the same genus. And here we're talking about two different genus, Herichthys & Amphilophus. This changes the rules a bit. You said something earlier in this thread about it (the fader gene) changing from a dom to a co-dom trait. In a sense thats sort of true. To put it more accurately, because two genus are involved, one of which is not affected by the fader gene, it begins to look and act like a co-dom gene, though technically it isn't. A perfect illustration of this is a true red texas, the texas blood of the fish is not affected by the fader gene, so the pearls express -in a co-dom manner- simultaneously with the fader phenotype..does that make sense?


