Hi,
I'm wondering which would be a better biological filter system for ceramic ring, lava rock, and pumice media (all 3 are mixed together)? I know the shower is proven to be effective but it requires the right media or else it is easy for water to channel and just bypass the media. That got me thinking for those 3 types of media, I would think the submerged application would be better but what do you guys think?
Thanks