I would agree with Phlounder. Just drill a hole about 1.5 - 2.0 inches below your water line and install a bulkead. You can use PVC with a basket strainer pointed upwards to adjust the water height in your tank and it will skim your surface water as well.
Can we get a mod to change this thread title to "Tangboy's Help Thread" ?

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150 gal Custom. Born 5/7/07. 50gal, 29gal, 20gal Sumps. 30gal Frag Tank. ETSS 800 Skimmer, Deltec APF600 Skimmer. PFO Solaris Lighting on Display and Frag Tank
My Tank Thread