I have one on a 37 with a 10 gallon sump.
So far I've had it for a little over a month and I'll tell you what, the air stone skimmer I was using on my 20 produced more skim then this thing...I've tried to adjust it both wet and dry and I get the same results. close to nothing.
one thing I really hate about it, it the way it's put together... it's made of cheap this plastic that snaps in place to hold it together..it's not what you'd expect for the money they charge for this thing...the other day I took it apart to clean it, another part that was glued in place came out with the pump..I think for the money you can buy a much better skimmer IMO.
One more thing. If you have an issue with it and you vent a little frustration about the product Tunze has only one guy in the U.S. taking care of everything..rub him the wrong why and you will get no help.
_________
20L, AC70, AC50PH, Cascade 150, 10gal Sump/fuge
about 20lbs Live rock, Skimmer,2x65 PC 50/50 in each 1 Cin-Clown 1 Blue damsel 1 blue/yellow damsel 1 Rock jummper 1 F-duster 1 Turbo 13 Cerith's 1 neon green star 1 neon green clove (on rock) 3 Zoes Fire & Ice Watermelon neon green 2 shooms 1 red/green 1 red/blue 1 Xenia...
*All I wanted was some fish in my bedroom* | 
Tunze 9010 
