ok heres the deal, im currently filling my 500g tank. i got 600 lbs white "desert" sand for landscaping and sandboxes from home depot... first im assuming its ok for my fish and catfish, but how necessary is it to wash? and what if i dont wash it will it just fill my 200 micron filter socks or will the water always b cloudy? its just a ton of sand (well just over a quarter ton) and how do you effectively wash it?