Well I've never had a mechanical filter on my tank before but they get filled with crud pretty quickly. All that crud makes a happy home for bacteria which in turn produce nitrates which affect your water quality for both fish and corals. In order to get that out of there I would imagine you'd have to clean it pretty often, whether it would be every week or every two weeks I'm not sure.
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Christy's Reef Blog
My 180 Build
Every electronic component is shipped with smoke stored deep inside.... only a real genius can find a way to set it free.
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