That skimmer should work well for you. It must be used in a sump though, and I do not think that it can be ran externally.
Quote from Marine Depot site
Quote:
The new EV Series skimmers are designed to run in sumps WITHOUT BEING RAISED. The output gate valve has been increased to a height of 9" (EV-120/180 models), which means that as long as your sump level is 9" or lower you will not need to worry about fluctuations having an impact on skimming consistency. The powerful EV-240 can sit in water as deep as 10".
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Just off of the top of my head here are some links to some protein skimmer manufacturers -
http://www.myreefcreations.com/
http://www.deltecusa.us/
http://www.euro-reef.com/index.shtml