BigOh-
excellent advice, I have four tanks in my room
the brackish tank has pool filter sand in it...the sand is beautiful, it is a great color of brown sand and black sand...it was a little dusty, but it settled in a few days, with some water change
in my 75g I have sandblasting sand from Menard's
it was 2.50 for 50lbs and it looks exactly like beach/desert sand, it is absolutely gorgeous
in my other tank I have black sandblasting sand, 3.47 for 50lbs, also from Menards
and I also built the particle board/cinder block stand for my 75g
the stand is 36 inches tall, 2 feet deep, and 49 inches wide
total cost: $51.37...beats the hell out of the pet store's price for a stand