now that ive learned you dont really need carbon in your tank, and therefore dont really need to keep buying new inserts for the penguin 350, i had an idea to modify it so that you dont need to buy inserts and still have adequate mechanical filtration and id like to know what some people think before i go through with it. i was thinking of removing all the material off the the insert and just keeping the plastic, inserting the plastic into the filter as close to the biowheel as possible, then stuffing the space on the other side with scrubbies. they will filter out all dirt and i would not have waste $50 on this filter. do you think this idea will work?