You can shut it off at night, I'm sure. I've heard some people that do this. For a while, my skimmer was overflowing at night, so I turned it off at night. Didn't seem to adversely affect anything.
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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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