Posted: Wed Jan 28, 2015 10:42 pm Re: Replacing carbon media bags
Carbon is there to remove harmful chemicals and some organic compounds. It gets used up because eventually it's adsorbed all it can.
Sitting out, wet or dry, it's not getting used up.
Nitrifying bacteria does colonize the carbon, but you pull that with every carbon change. Do exactly what you would have done with it during the regular change.
Tobi a RES born in 2012
1 dog, 1 teenager, 3 aquariums filled with fish, snails, shrimp and a bit of algae