tbrazil230
Aquarium Advice Activist
I'm filling my new canister filter and I'm just curious if one is better than the other
Bioballs are meant to be used in a trickle-down-system, not submerged. Knowing this, I'd picks the rings.
I was mostly worried about the ceramic breaking down over time, especially since fluval recommends changing them every 6 months, which I wouldn't do, but I figure they say that so you keep buying them