yellowtruck75,
I have to rotate the tank by hand. This is only for reaching the back of the tank.
It actually takes a significant amount of force to rotate it. There is something like 250 lbs of sand and just over 100 gallons of water in it. It is pretty heavy
I think the idea of rotating the tank to aid in curculation is neat, but it would probably eat up more electricity than running water pumps.......unless you can coax a pet into running on a treadmill belt drive or something like that....hmmmmmm