I don't much like the chart.
Ignoring KH of the tank I just target a pH drop of @ least 1.2
The "Phishless" tank gets a 2.2pH drop but after 1.6-1.8 pH drop I don't think anything gets better.
Are we growing plants or raising phish?
Prefer items that do not contain sodium (baking soda)
KH of 2 and even less can be great for many plants.
I'm glad all the Buce roots and such took off well.
If interested in plants PM me!
I'm trimming lots right now and the garden is growing.