I just did mine this weekend. Like previously said i rinsed that sand very well. Take your time with this step. Removed all old gravel did a quick w/c. vacced out and crap on the bottom glass. then used a big measuring cup with a handle to scop it up and slowly submerged it in the water making a big pile then pushing it flat. Check out my last thread for before and after pics.
http://www.monsterfishkeepers.com/forums/showthread.php?t=236297
http://www.monsterfishkeepers.com/forums/showthread.php?t=236297