Carbon cleans the water. Only time you need to take the carbon out is if you medicate the tank, for the carbon will deplete the tank of the potency.
The gallons per hour should be twice the tank size. I looked up your filter and it's over twice, so this is very good.
The best thing to do with a filter is you don't want the jam it so tight that it restricts the water flow. It appears from the link from Aqueon - http://www.aqueonproducts.com/products/ ... 74412.htm#
- that the filter bag is fine as it is.
Of course I am partial to bio-wheels. Marineland Emperor BIO-Wheel Powerfilters are the best with the hang on the back types, it provides a lot of room to add all types of media.
The key is, try not to restrict the water flow. If you can accomplish this, you'll be fine.
I'm sure others can help you too. Let us know how it goes.