Originally Posted by MonaLisa
I hope that someone is still viewing this thread that can help me with this. On another thread that I can't find anymore (did a search), someone has a HOB skimmer very similar to mine, and he said that he removed the biofilter. I take it that's the stuff that is crammed into the output side of my skimmer. What exactly is the function of that, and what would be the benefit of removing it? Just want to make sure I'm doing this the right way.
Any responses appreciated.
Lisa :happyfish
The biofilter is where the bacteria colonize, some people say that they will cause your nitrates to go up. Most bio media are excellent at removing ammonia and nitrites but do not remove nitrates. The reason for this is the bacteria that convert ammonia and nitrites live in an oxygen rich environment, the bacteria that convert nitrates grow in an oxygen deprived area such as the bottom of a deep sand bed. If you have a good amount of live rock and a light bio-load I would try running without it.