Yeah, FH's love bright background's and a bright environment. Everything that I have read leans towards if you have your FH with dark substrate, decor, and background their color will wash out and become faded.
I would breed FH with FH and then cull the fry down to like the top ten or so when they reach a decent size to see their potential. Have you thought about how much room you'll need to get the fry that large, to be able to determin value if any? I'm only asking this because I intend to try to breed some Fh's in the future and have realized how much $$$ can be spent just on raising the fry.