Originally Posted by nwbradshaw
Would the LR
rubble be put in the same place as the bio balls were, in the stream of falling water?
Typically bio-balls are suspended above the water allowing the water to trickle through them. lr
rubble would be far more effective if fully submerged so bacteria can properly build up within the lr
and on the outside. (Itâ€™s the type of bacteria that builds up inside that is most important since these types help keep your no3
low.) Most use baffles to direct the water flow through the lr
rubble and to reduce air bubbles before the return.
If you can convert part of your sump into a lighted refugium it would help with filtration/nutrient exportation as well.
rubble in the sump alone is not going to be sufficient for bio-filtration. You will need approximately 60-90 lbs of live rock in the main tank to handle your bio-filtration.