Just a quick word on bacteria (not product, bacteria) :
If by now you have read this thread and you do not understand at a basic level their importance (that they are important) to the overall system then either A.) I am not explaining it well or B.) you are an idiot.
I do not mean just nitrifying bacteria for cycling.
This isn't directed at anyone or in response to any particular comment. It's a stressing of the point!