Triggerfish-That is how the setup I saw worked, it kinda mimics the suns path across the sky. In fact I assumed thats how they all worked, didnt know they rapidly moved around the tank. I didnt really get to look "under the hood" but I believe he said it was hooked up to some type of screw, I dont remember if it was periodically turned on and off or if it was a high torque very low rpm motor. My understanding is it took all day to get to one side, then when it hit the stopper at the other end, the motor experienced resistance and autoreversed. So at night it returned to its normal position. Again, something I need to do much more research about, but I think using the proper gear ratios it could definitly be done. Maybe someone will chime in with more info, thanks for all the input so far guys, very helpful.