I have a fluval two and it in the cuboard where it belongs fine for a 12 gal with a few small fish.
The sponges in the fluval two is the brown muck only at the top of the sponges and the bottom clean as i turn them around so they get an even coating of bacteria on them.
The sponges in the fluval two is the brown muck only at the top of the sponges and the bottom clean as i turn them around so they get an even coating of bacteria on them.