My Xenia does the same thing, so it isn't just you. I'm not overly concerned about it because there seems to be plenty of it.
If you really want to experience something...haul a piece of that dead section out and give it a sniff. Few things get me like that particular smell...man...
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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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