Today I was scanning Youtube and I ran across this machanical, pvc, motorized, lift and dip back into the water scrubber. I thought it was kinda neat, but it sure does take up a lot of room.
Just thought I would share the video... Not A lot of green, but it was well thought up and made for the design....
I noticed there was no algae where the light directly shined on the screen. Might be to high of a wattage bulb burning the algae......