Pot scrubbers, lava rock, bio-max, substrat, substrat pro, cell-pore. All of these are great bio medias. I would only use carbon for removing meds from your tanks.
Use the scrubbies with a prefilter on top and some bacteria in a bottle, fill with used tank water and let stand for 30-60 minutes then fire it up. Tank may cloud a little depending on the chemistry of the tank It may start a mini-cycle. Keep an eye on the tank chemistry.
I wouldnt even use activated carbon for inside your cannister, unless you like to take it apart and replace it often. I would put the classic media in there, like ceramic rings, Ehfisubstrat, bio glass, biostars. etc.