I decided to upgrade my filteration and go with my first canister. I am getting an XP2 today and had as question. Along with the foam pads and carbon it comes with what else do I need to buy to add to the filter baskets? Or I guess What do you put in there? I am looking to add it to my 120 gallon ca/sa tank so no special requirements. I was thinking of stuffing more bio media in there but wanted some suggestions.