I find it difficult to believe that it's an 02 issue, unless you've drastically changed something in the last few weeks. Chromis are very hardy! Salinity? PH? Have you changed foods? This may be a long shot, but are you using any new hand products in the last few weeks?
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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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