If you are really looking to get your tank "cleaner" micron filters are the way to go as they trap the smallest particles like micron vacuums. The cheapest ones I've seen are from Magnum, and they are often used in conjunction with other filters, since they specialize in "polishing" the tank.
Another option is something like "Clarity" which is a chemical from Seachem that binds micro floculant and makes them drop out of solution making them easier to pick up with normal filters.
Seachem. Clarity
However I agree with Aspects 100%. If your fish are happy and healthy then your water is "clean", good circulation is key to keeping the tank clean, and carbon is not needed on a day-to-day basis.