[Bernd Bussler]

Right, I agree with you, the lower the KH / us the easier it is to lower the pH.
But as I said, get to the “exact” pH value not so great thoughts, I do not do and I have last year about 400 Paros created for different types without attending to adjust the pH “exactly”. Water changes and good food in my opinion is important, and plenty of rest, my Paros see me only once a day, otherwise they are alone and live in peace.