The Planted Tank Forum - View Single Post - cycled filter left for a few days.
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post #13 of (permalink) Old 11-14-2012, 11:21 PM
Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Posts: 10,505
That sure can happen. If so, then the tank is cycled!
Bio filter can be plants, nitrifying bacteria or both.
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