why take out the carbon? it is already there and you already paid for it and the filter padding. i understand that many people have this thing against carbon. and although i disagree, i understand not adding any if that is the method you prefer and are successful with. but why would you destroy this filter cartridge that you paid your hard earned money on? i can get them for just over cost, so i buy new bio bags for my whispers. although i do rinse them off to get them to last more than one go round in the filter, mainly in the turtle tank that happens to use 2 of the XL bio-bags. every filter company gets good oney from filter cartridge sales, not just marineland. and if they have come out with such a good filter and sell it for so cheap, maybe they deserve it.