bio filter
Unless you have a powerful UGF, your filter system isn’t designed to get the stuff out of the gravel. That is done when you do a gravel vacuum during your weekly PWC. If you do have a UGF, then you should have some polyfill or flosspad type filter media which should collect most of the small stuff. The rest gets vacuumed up during the PWC’s.
Lenny Vasbinder Fish Blog - http://GoldLenny.blogspot.com
Category: Philippines Internet Koi Society
