I agree with this 100%All of the above or go buy a Fluidmaster unit one for each toilet in the house and a couple spares for the shelf. They look like the attached photo and to adjust them you turn the knob at the top. At the bottom you see a white ring, when you pull up on that it lets you move the unit up and down in 1” increments or you can pull the whole unit out and stick a new one on the old base. This saves you from crawling behind and having water run on the floor leaks and all the rest plus it is quick to do and you don’t touch the plumbing.
I have all these at home and her mothers house and her grannys house and anyone else that calls me when their toilet is having problems. If it is a fill problem I turn off the water flush the toilet snap the old unit off and snap the new one on turn the water back on. Then I go have cookies or pie and coffee as payment. View attachment 25643
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