Simple answer- none. For me there is no need of chemical filtration unless there is a chemical substance to remove like medicine. For that I would keep carbon on hand to be added if/ when you do need to use medicine and then want to remove it. Tannins(color) is also where I might use carbon, just not most of the time. For normal running, I might add some media to act as a bio-filter. I feel there can never be too much bio-filtering as long as it doesn't restict water flow. Having two bio media types would give you the advantage of being able to clean one and know the other is undisturbed.
What chemical filtration media do you recommend I use in it?
Add me to the none list.
The cage for media is so small, whatever you can stuff in there wouldn`t be of that much help.
The construction of the cage makes changing media more than a bit awkward as well.
These Magnum series filters are great for removing particulate, but lack the media capacity of the standard canister.
You plan on any other filter for your tank?