sick tank

my only worry wit sand is that it would wash out the color of my fish and i have a blue background as opposed to your black so maybe it would actually wash out the color... i went to home depot yesterday and all i found was this gray sharp gravel? is it possible that gravel is out of season? lol im thinking ill do a river rock/gravel mix wit some flat slate rocks to hide the plumbing and il have some powerheads to keep the poop moving lol i just gota find it cuz homedepot is letting me down alot lately