Try what has been mentioned... But if that fails, open up the impeller of the pumps. I've had debris stuck in the impeller vanes and it doesn't take much to cavitate the flow and cause micro bubbles.
Not theory. It happens to me all the time. My system has two OM4ways on two Darts.
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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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