It is going to SMELL to high heaven!!! Nothing on it is still live... HEre is my advice and I am sure it will get me a neg rep point somewhere. If you are cycling your tank, put the sand in as is. What better way to kick start a cycle then with rotten sand that already has all the ammonia that you will even need in there. Just stir it up a bit about a week and a half into the cycle. It will take a bit to cycle but I believe you get a stronger cycle that way. Stronger cycle = more bacteria. More bacteria = a good thing. Kind of goes back to the old old school when people used to put straight ammonia into their tanks to start a cycle.
Just my advice...