I jsut got done converting my tanks to white sand. I wasn't sure I would like it at first since I origianlly wanted something darker. I just went down to my local Home Depot and bought a 50 pund bag of the Quikcrete Comercial Grade Fine Sand. The number on it just above the UPC says #1961. Looking back I don't think any other color would look better, and I love the stuff. I think it cost me like $3 or something, but I know it wasn't over $5.