The purpose of the sponge is to remove as much particulate waste as possible. Cleaning the sponge for 2-3 minutes under hot tap water removes all the waste from the sponge. There is biomax in the AC110s and a canister packed full of biomedia. Ammonia zero, nitrites zero, so not having enough bio is not a problem.
The better your mechanical, the more waste you can pull out of the tank. Before it breaks down into ammonia, this leads to lower nitrates.
The better your mechanical, the more waste you can pull out of the tank. Before it breaks down into ammonia, this leads to lower nitrates.

