Christy, does it still glow under actinics? If so, the tissue is still intact. If not, or you've seen the tissue slough, you can snip off the dead area with side cutters. Looks just bleached though. Montipora are fairly hardy and there is plenty of live tissue there to recover. Make sure it isn't too far off the lighting it came from (if known) and keep a decent current in the area to remove toxins/slime and provide O2 and food. It should be OK.
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Brad
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