[Aqua Pro Builder]

The tank does rotate. The rotation has 3 major purposes:

1)The house is not big enough for a 5 feet round tank to sit in the middle of the room, so the rotation will slowly bring out the "back" of the tank to the viewer.

2)It was designed to mimic the angles of the sunlight from day to night and vice versa

3)The tank will rotate while the light is stationary thus making a lighting effect not to stay stationary and minimize fix directional growth of some SPS.

The next design will include variable speed to mimic the cloud shading effects. Current implementation is fixed speed due to durability issue of the motor. During making of this prototype, variable speed will shorten the life of the motor which defeat the purpose of automation. I expect variable speed will be incorporated in the next 10 feet round tank in couple months. Stay tuned.