I have the Tunze 9010 on my system (100 gallon display, 40ish gallon sump). I absolutely love it, very quiet and easy to use and pulls a good amount of skimmate as well. You can use it in-tank or in the sump. Very energy efficient and a small footprint as well.
I believe "Doug" did a formal review of his 9010. There's also a ton of info on them at Reef Central.
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