The Editor said:Hang on... My basic understanding of bio-filtration is as follows:
Ammonia -> Nitrites -> Nitrates
In all circumstances... Surely all biological filters are "nitrate factories"? That's the point of them?
The Editor said:Hang on... My basic understanding of bio-filtration is as follows:
Ammonia -> Nitrites -> Nitrates
In all circumstances... Surely all biological filters are "nitrate factories"? That's the point of them?
Not all biological filters are nitrate factories. Mud beds or deep sand beds are just the opposite. The bacteria that consume nitrates are araerobic and do not like to oxygenated, and prefer to live deep in mud or sand beds. That's why many in the aquarium hobby, both freshwater and salt, are adding refugiums to their systems. Other than my sons little 20 gallon freshwater (which has a marineland emperor 400 bio wheel), I have mud beds in all my tanks including freshwater. Much better than wet dry in my opinion, which have always been nitrate factories for me.
The Editor said:Ah ok.. Granted I'd completely forgotten about anaerobic bacteria
But the anaerobic bacteria that live in the deep mud/sand beds still require the presence of Nitrates in the water column for them to digest them into nitrogen. So the Ammonia -> nitrite -> nitrate step must still occur at some point or time in the bio-filtration media?
My main question is how is a "nitrate factory" different to any aerobic biofilter that converts the ammonia to nitrates?
+1 to this. Old school aquarium keepers believed they could not produce an anaerobic area for fear of releasing toxic gases along with the nitrogen. There are still lots of people who will tell you that upsetting a deep sand bed will release toxins. In old school, you got rid of nitrates with water changes and plants.