I have a poly tank with a black background and black sand. I want to change it because it just looks too dark. I want to replace the black sand with tan colored pool filter sand and add a bunch of fake plants. My polys colors are pretty good right now. I have some delhezis and endlis and both of them have dark stripes. I was wondering if I change to tan colored sand if that will make my bichirs colors fade or look washed out?