"Guayni; SAHS" wrote in message ...
[..]
In summary, nitrogen is an element that needs to be controlled
in your system.

Not only one... and this one is pretty easy...
Write next article about phosphorus in phosphates - that is worse!

The nitrogen cycle works only one way.

Sorry Jaime, but this is bunch of BS...

All guys here with deep sand beds in their reef tanks
or ones having incorporated "plenum" experience very,
very low nitrates in their tanks at almost limiting
levels due to the magic actions of anaerobic bacteria
living in the anoxic layers deep in the sand or plenum.

Ongoing problem in deep sand beds is reported by many
reeftank owners high levels of phosphates. These are
not very easy to remove by harvesting algae, especially when
nitrogen already became the limiting nutrient component...

Dakin, N. 2003. Complete Encyclopedia of the Sal****er Aquarium

Nick Dakin did not mention anaerobic part of the nitrogen cycle ?
Are you sure ? Look again... or switch to a better reference.