mmm. Too late. But it wasnt too bad. It was only about a half bag of sand that I used and in the drive home it was actually washed pretty good. All the mud settled to one end of the tank and I took the cleaned sand from the other end. Kinda cool really. All I have left is about 30-40 more gallons of water and then turn the pump on. I ended up using about 1/2 bag of the old sandbed from the tank, I'll add some of my current sandbed from my existing tanks, and it will end up with about 15 gallons of water from my existing tanks today after I do my water changes. The rest will be new water and 4 bags of new rinsed southdown.