So I hear all the time people saying don't put bioballs and sponges in the back compartments because they are nitrate builders. The sponges I understand because they can trap food/waste etc. However, if you are not creating nitrates than that means your wastes remain in the form of more toxic ammonia and nitrites and eventually are broken down to nitrate anyways. The nitrates are going to be there eventually, so what does it matter? I would like to hear some peoples input.