1. Dump the balls and just use the LR.
2. Make sure the LR is bagged so you can take it out monthly and vacuum the back compartments. You'd be amazed how much detritus ends up back there.
3. Keep the carbon. Pulls a lot out that the sponge/floss misses.
I have 1 of the sponges, the carbon, and LR in the first chamber, more LR and chaeto in the 2nd, and my heater in the third. The chaeto's been in about a month, and I'm seeing a huge difference in filtration.