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Old 04-06-2008, 05:34 PM   #1 (permalink)
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i have a new tank going thru its cycle. ther are pockets of air under the surface of the sand, against the glass. they look like grey colored pockets from a distance. is this nitrogen gas forming?


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tank filled 04/01/08

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Old 04-06-2008, 05:36 PM   #2 (permalink)
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No just air that was trapped in the sand the dust gives the bubble that opaque look


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