If you don't have some kind of surface water removal (to a sump), then an airstone in the tank will turn your tank into a full size protein skimmer. You'll have a good scum on the surface.
When I had my hex tank, I ran the return pump from the sump into a SQWD which split into two opposing outlets in the hex. Every 30 seconds or so, the current would change from clockwise to counterclockwise.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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