09-05-2012, 03:24 PM
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I would not use bleach on anything that will absorb liquids, such as filter media, wood, rock, gravel or sand. It is next to impossible to ensure all of the bleach gets rinsed out.
It is OK touse bleach to clean the tank glass, filter itself and filter tubes, but rinse everything very well in plain tap water afterwards and allow to thoroughly dry in air before re-use.