I was at Home Depot earlier today and was going to pick up some sand for the tank I am setting up. I found some "White Play Sand", but on the bag it states "Do not use in Aquariums". I thought I had read a lot of posts on here saying that you could use it. Do they say this because many people do not know better and never rinse the sand before putting it in the tank? If this sand cannot be used, what type of sand can?