So I was originally going to use a large canister filter for my tank, but the Mrs commented we should get a bigger tank for more fish. I immediately said I believe you’re right dear. So, I’m looking at a 150 gal I found for sale. Going to that size I’ve decided I need a sump. My question is, I’d you use bio balls or something like that, do you not need a refugium. The sump I’m looking at doesn’t seem to have a spot for one when I get my skimmer and other stuff in there but there is a spot for bio balls but no waty to mount a light the way it’s constructed. I’m right to assume the bio balls will be the biological filter so no refugium needed, right?


