Trim the necrotic (white) tissue away and see if it recovers. My guess is that it was exposed to air at some point, even if you're not aware of it.
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~Drew
10G Nano * 10G Sump * Deltec MCE 600 Skimmer * JBL Viper 150w MH * Zeovit * Vortech MP40W
Millions long for immortality who do not know what to do with themselves on a rainy Sunday afternoon. ~S. Ertz
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