Has anyone used the area [in a large CPR Backpack] where the bioballs were and the return into the tank is, for a refugium? If so, what is required? eg. lighting, sandbed, live rock,etc. I want to use it to grow food for corals mainly and perhaps a purple tang. My 75gal. tank has been going for allmost 3 years and the Backpack is only being used as a skimmer now, no bioballs,carbon or phosphate sponge. So I was thinking of useing this area for a refugium.
David
David