Prebuffered coco is nice because it comes at 5.5-6.5.
I just adjusted my PH with every watering just a little. 5.8 then 5.9, 6.0, 6.1 and repeat that way it’s working the areas getting closer to lock out on the fringes.
For soil you need to be a little higher. I’ll find a chart autolowrider gave me.