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Full tank | by jumpingspider
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Full tank

Amazingly, this didn't smell bad; just a faint fertilizish whiff. This is where the bacteria and protists are busy breaking down the ammonia into nitrites and nitrates. Later, they starve the bacteria of oxygen, and they go to the anaerobic stage, breaking the nitrates and nitrites apart and releasing pure nitrogen gas. Nifty.

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Taken on February 29, 2008