[bradlgt21]

Black sand hides dirt and algae well. White sand shows everything. However some fish tend to have different colors over different sand. Force instance any orange or yellow African cichlid should be over light sand as it makes them bright colored. Over black they kind of turn brown again. Yet some fish like black calvis have great dark colors and the white spots pop over black sand , over white and the fish washes out to a more gray color. So there are benefits to both.