That's too bad. If you ever see this again, it requires painful, immediate intervention. As others have said, frag mercilessly. You want to remove pieces that are completely away from the dying area. Usually, I'll dip the frags in an iodine before mounting them somewhere else.
I have also experienced that one coral dying in this way, can lead to a catastrophic, massive die off of every coral. I have a theory about this, which I won't get into, but dead/dying pieces should be removed from the system as soon as you see it.
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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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