? Did you have something you actually want to say? You know I don't need a gh/kh/ph primer. How was that a response to my post.
There isn't anything in this link that provides any sort of refutation to osmotic shock do I am not even sure what you are trying to convey with it as a response to my post.
Sent from my SGH-M919 using Aquarium Advice mobile app
"What is the importance of testing for PH?
Generally, despite popular opinion, KH is more important a regular test than pH since it predicts pH instability.
This said, test for pH is important before and after water changes, this includes the new water to be added after a water change so as to prevent pH shock by adding water to an aquarium that could change the aquarium pH more than .5 either direction on the logarithmic pH scale.
Reference: Aquarium, Reasons and Methods for Water Changes
Many planted aquarium keepers, often run air stones at night to equalize oxygen and COs since plants cease production of O2, HOWEVER it is worthy of note that an air stone can drive off enough CO2, that the pH can climb considerably at night.
So it is important to test pH evening and morning and adjust your air stone accordingly to prevent to drastic a pH swing.
BTW, the reason for this is CO2 in the water can produce carbonic acid, that will naturally lower pH, but when driven off by nightly increases in aeration, this can result in pH swings, generally in smaller aquaria.
As well, pH should be checked when problems occur in your aquarium such as fish sick, then compare this pH to past tests (which it is best to record all aquarium tests in a journal)."
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I know you are not dumb to water science, the text is there, the whole page may be useful to other people, I thought about pasting just this section but the whole page is there for use. (Evidence of existence)
You really don't need to defend your knowledge or impress upon me your skill level, the reason we can engage in such debate is because you know enough to count.