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Old 07-20-2014, 11:00 AM   #11
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Thanks for the info guys. I think I'm going to get some more critters to stir it naturally. I have read that most snails and critters "stir" the top inch or so. Are there any that go down deep?

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Old 07-20-2014, 12:01 PM   #12
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I don't think you want them to go too deep. The only life down there are creatures that can survive in low oxygen zones.

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Old 07-21-2014, 12:45 PM   #13
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The same bacteria that CAN survive in the O2 depleted zone are denitrifying bacteria. That is the whole purpose of a DSB. They feed of Nitrates and produce non-organic nitrogen gas, and of course the bad by-product of some H2S gas. Stirring the DSB will prevent any potential build up of H2S, but it also will oxygenate the DSBs deep zone, killing the Anaerobic bacteria, feeding the nitrogen cycle, and rendering the whole purpose of a DSB futile.

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care, sand, sand bed

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