Originally Posted by Byron
With respect, if you carefully read the article it makes it very clear that with regular partial water changes an aquarium will have a more stable environment.
An aquarium that receives no water changes gradually declines; this is not stable, and it is not healthy.
The evidence is overwhelming.
then we agree to disagree.
Your article has no analysis whatsoever. Just statements of opinion. Again one can look at the equation above and determine whether or not preventing the builds up is more effective then doing water changes. That is unless you do 100% daily water changes should you have an unlimited source of acceptable water. But in that case we are maintaining an open system which is entirely dependant on the source water-- not a closed system that is totally dependant on the conditions of the tank itself.
Your article also does not address how the stability works. For instance what happens to the system should ammonia bump up suddenly. With a planted tank the plants consume the ammonia directly breaking the dangerous spikes and preventing tank crashes.
Stability by definition is how the system reacts to deviations from some steady state. Not whether or not the environment is constant. It is entirely possible to have varying stable systems and constant unstable systems.
Comparing a planted tank with no water changes to a human living in a non planted room with no air changes is a false misleading and inappropriate analogy making an emotion appeal to people. A much more appropriate and realistic analogy is comparing such a tank to the entire ecosystem of the earth. And even that is not totally correct as the tank would be a much healthier environment.
But then all people have to do is run a unplanted tank with 10% weekly water changes and observe how the nitrates rise to 100ppm or more. And them observe the heathy planted tanks where nitrates and phosphates are unmeasureable.
So I guess we agree to disagree. I do notice that I'm the one with the numerical analysis. So again you may want to determine why nitrates/phosphates are unmeasureable, pH is high, in all my tanks fw and marine. Plus kh and gh constant in my fw. And cal, kh, mag kept up with dosing in my marine tanks. All with no water changes using untreated tap water. Perhaps that stupid equation of mine might help.
But who am I? I just ran tanks for 8-9 years with no water changes. So all this must be worth at most.