Dr. Rons article although a good read, when it comes to the denitrification it's all based on too many assumptions, how do you create the perfect velocity through live rock? Where do you find rock with a uniform porosity? Way too many things have to happen for this to work.
"it is possible that dissolved materials such as the various chemicals constituting the denitrification cycle do diffuse into and out of live rock; however, it is unlikely that such diffusion moves any significant amount of materials."
Seriously I think the algae growing on your rock is removing more nitrates than your rock along.
For those maintaining zero nitrates without a skimmer, what kind of tests kits are you using?
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