I recently bought an aqualcear 110 filter off amazon. It runs great and is so quiet for the amount of water flow. A long standing habit of mine is to do lots of water changes for my aquariums, to keep the fish healthy. So, for a long time now no carbon has been used in my aquariums. Yet, the filter came with a carbon pouch. Without the carbon, there is alot of free space inside the filter basket. What media does everyone use in their filters, specifically their aquaclear 110s?