I have a 12g JBJ. In the first chamber I have the heater along with some live rock rubble. In the second, I have the backing cut away, some cheato and Chemipure, with a 13W power compact. I am actually thinking about taking the Chemipure out most of the time and only running it a few days at a time when I think the water needs some polishing. Third chamber has the pump and I have run Phosban in there before when I was having Cyano problems early on.
All in all, I really like my setup. Seems to keep nitrates in good order and the Cheato is also an excellent breeding ground for pods.