Equipment to put in biocube 29 back chambers

Hi! again... lol Ok so after finding i should remove the bioballs from my corallife biocube 29, i need to know what to put back there. I know for sure i am getting this media shelf/basket: http://ift.tt/V3GSmX . So what else should i put back there? One other quick question what should I put in my media shelf other than filter floss?