Media is the porcelain balls that you put in your filters, or bio-balls, or scrubbies. Carbon is just something you add, there is no need for it, imo. Like I said, Google, carbon in freshwater aquariums.
No need to use carbon, it removes the good and the bad, so its bad IMO, if you are set on using something use purigen. its rechargeable and in long run less expensive.