That coral looks beyond saving. Take it out and frag off any remaining healthy bit ASAP. As it goes, I think it is causing the reaction you are seeing elsewhere. You've got one coral there sending out chemical signals of stress and death. Of course it is upsetting to the others!
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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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