I'm running a i-Tech 200 on my 150gal. I would have to say best $400 investment I spent in reef equipment.
Current Specs
Model 200 Cone Skimmer
Cone Base: 8?
Cone Neck: 3 ?
Overall Height: 23 " (Needs an extra ? clearance for cup removal.)
Recommended Pump: Tunze 9420.04 Hydrofoamer
Recommended water level: 7 " (A stable water level will increase performance and decrease adjustments.)
Airdraw: ~800 lph (28 SCFH) @ 23 watts in 7 ".
Operation capacity of up to 200 gallons with a light to moderate bioload.
http://www.i-techskimmers.com