The obvious answer is to get the flow going clockwise for a while...then have it reverse and go counter-clockwise for a while...then...
That's what I did with my hex tank and it worked well. I used a SQWD, but you would probably want more control over the timing of the flow reversal than a SQWD offers.
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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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