I have the smaller one made by SEA. It has been on my sump for less than 2 weeks and already shows signs of algae growth. Used the clip on lighting system from Home Depot with a 10 watt energy saver bulb ( equals 40 w standard ). I tapped my return line, cut the plastic screen 1" below the water line, adjusted the valve for a gentle cascade of water and away I went. Every article I have seen about scrubbers talk about the algae eating the phosphates and nitrates as a food source thus lowering the levels in the tank. All natural and an easy fix to a troublesome problem. I see no reason for it NOT to work.