This is a little off the topic, but check this out:
www.aquaticrevolution.com
They are quite reasonably priced, but out of reach the average aquarist. He makes an attachment for algae scrubbing, it pulls algae magnet up and down, polishing outside and cleaning inside. Auto cleaning, how cool. All wiring and plumbing are internal, passing thru center overflow. Fish really dig these, @ MACNA he had a bunch of false perc's and a few black perc's smimming around in it. They paired up in groups of 2 to 3 and swam circles. Besides the fish factor, the craftsmanship is extremelly high end. Pictures don't do this system justice, you've got to see this one in person.
Acrylic cylinder 
