I have the same tank and the more I read and talk to people the more I am convinced to swap the bio-balls for live rock. I was thinking I would take the bio-balls out go to the LFS and get the same volume of rock. Do i need to quarantine the replacement rock or can I dump it in the middle compartment where the bio-balls were. Guy at the LFS also said he runs Chemi-Clean I believe it was. Sounds like some sort of additional filter.
you don't need any light to get the full benifit of the LR, but once you turn that middle chamdre into a fuge, thats another story. I was able to stuff a couple of lbs. of LR rubble into my tank though its a 8 BC!!! :scared: