sand

i'm in arlington and have done some google searches but nothing has really come up...anybody know where to buy? i only need a 50 lb bag

I am thinking of trying sand for a substrate, for the first time. How thick should I have the bed and how do you clean it?

I'm about to set up a small Tanganyikan tank for shellies and maybe some goby cichlids. I'd like to use sand so that I can see them in a more natural habitat than the crushed coral I have in my main Tang tank. However, I tried black sand in one of my first tanks a long time ago and gave up in...