I was wanting to add more biological filtration with the addition of ceramic rings in my sump. the only problem is my sump has two sides. Both sides (separated by sponge) have a heater in them. Can i put bags of ceramic rings right on top of the heaters? Also, which side would be better to place the media? the side to the Left of the sponge (the first chamber) or the side with the pump (right side)? Thanks