Mike...You can use the bioball chamber as a mini-fudge if you want. You would just need to add some light. Put in LS
, or mud, a few large pieces of LR
, mangroves and stuff. You can grwo calupera algea in there. That helps with nitrate removal. If you are having trouble finding LR
rubble keep loking. You may end up just buying regular LR
from the LFS
and smashing it with a hammer into rubble. It does not have to be high quality LR
as it is just going into the sump.