The Planted Tank Forum - View Single Post - cycling a filter in an established tank?
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Old 01-25-2013, 05:14 AM   #9
ronnie6989
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Default Water Column

There is bacteria in the water column.......
Aquarium Aerobic Bacteria and Anaerobic Bacteria are in the water column. They is more bacteria in the filter and gravel but it also found in the water column.

http://www.youtube.com/watch?v=NU7UjA0AHos
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