also I got Play sand from Home Depot it was unber $4 for the 50lbs bag...I only needed one for the 55. From what I hear Toys-r-us has a white play sand and you can always get black taitain(sp?) moon sand. Depends on the color you want. Just if you get it don't make it too deep so no harmful gases can't build up. But you cichlids will stir it up for you anyway.