Clean your filter media?

I wouldn't use just any sponge in the filter :) . There are sponges sold for AC filters, but you can buy bulk sponges from places like Big Al's Online and just cut them down.
 
I rinse out the lumps from the filter media every week in old water when I do a water change.

I replace the media every few months, but put in a snippet of the old media to get the bacteria going.
 
Stick to aquarium sponges. Fish stores sell many varieties. I have used the Fluvavl replacements in the past in place of a whisper cartridge as it can be jammed in place.

Regular household sponges are often treated with anti-mildew agents and thus could leach something into your aquarium.
 
I rinse my filter media in regular old tap water bi-weekly,and that includes my ceramic filter media.I have never lost my bio-filter colony.
 
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