I think the c-160 only comes with the bioballs. You have to step up to the c220 to get the ceramic tubes.
It comes with filter sponge on the bottom, next tray has a bag or two of carbon, and the top tray has bioballs, and then a polishing pad on top i think. In my c220, the extra tray is on top with the ceramic tubes, and then the polishing pad on top.
I've stopped using the carbon, as i was only using it to remove some tannins from the water. Now i've got the filter sponge, polyfil, bioballs, ceramic tubes, and polishing pad, in that order, bottom to top.
So... you could put some of those tubes in the middle tray, and forsake the carbon bags. Or polyfil (floss). Up to you. I'd reccommend some extra polishing pads though. You can rinse out the filter sponge for a long time and keep reusing it.