Actually, I used it on a overstocked 40 gallon, but it IS a pretty good skimmer when set up right.
I got this much skimmate at least once per week:
I used a mag 7 to power the skimmer with the turbo-eductor on the intake side so the pump chopped up the bubbles before sending them to the skimmer. Some people use the venturi on the outlet side of the pump, which still works, just IMO, not as well.