Originally Posted by remiska28
Indjo, why don't you mix red to anything nonred? Is red a dominant gene? Or is that a personal preference for you?
Fightergirl is right - red is difficult to clean out. I prefer solid, clean colors like your second male. It would take a few generation to clean out (totally) the red genes.
If you breed the copper to the classic, you would get a variety of possible outcomes. If your copper has a strong back ground, you may get some coppers. You will most probably get basic colors with red fins (incl. the classic color)
I don't think true silver and true blue can show on one fish. At least I haven't seen one. You can try combining your copper PK to a blue. But IME you would mostly end up with steel blue, blue, green and a darker shade of copper (not a silver shade). Then inbreed the colors you like best to make them breed true.
I usually cull by feeding them to a bigger fish - currently : catfish and gurame (?spelling)