I have a 55 gallon DT with a 40 gallon sump, it originally had a ghetto DIY overflow/scrubber that was poorly lit and caused water leaks. for the last 6+ months the only filtration I have had is macro algae in my sump lit by a 3' t8 shop light with old 6500k bulbs. My sump is now PACKED with chaeto and calurpa (the 2.5 gallons I removed last week didnt even make a noticable dent), and my DT hair algae is out of control. I finally cracked down and bought a L2 scrubber, which I recieved yesterday, and I have to say I am VERY impressed by the quality of this. Everything fits together beautifully and its a very nice looking piece. Bud spent a ton of time with me making sure I had everything I needed for my install, and other then an optional piece I had to grab from home depot, it had everything I needed to get it working in the box. It took me a while to remove my old crappy overflow and replumb a new one in, but I am finally done and this is the result: Video of it running, does the flow look about right?