So what is the difference really? like I was thinking about buying a new aquaclear filter but then I noticed that my marineland penguin has a small slot in front of the cartridge. Can't I just jam a bag of media in there and it will be just as or almost as effective as the aquaclear's media? or can I take the Cartridge out and set it up like a aquaclear?(sponge base, polyester mid and media bag top + the bio wheel) and it will work?