Thanks for all the feedback. I had done a water change the day before. During that change, the tank can often get blasted by bubbles, so that could be where the problem occurred.
The fish continues to be unbothered by the symptom. I suppose there is little I could do about it anyway.
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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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