You have a leak somewhere. The air has to be coming from somewhere. Check the connections near the circulation pump and on the line to/from the circ pump. Air could be being drawn in just like a venturi.
Are you sure it is air? Could it be C02? I've never seen this, but maybe you are putting some much C02 in that it react in time and builds up.
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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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