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Sand bubbles can usually be three gasses. Nitrogen if you have a DSB and the bed is removing nitrate. Carbon dioxide, usually at night, produced by algae and oxygen, usually in the day, produced by algae or denitrification. A bubbly bed is an active bed and is, as Martha Stewart would say, a good thing.
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"Leading the information hungry reefer down the road to starvation"
Tom
Current Tank Info: 130 Now out of service and a 29
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