So I been dealing with a stunted WW auto in straight FFOF for the last three weeks, planted 12-24 periscoped 3ish days later. It’s clearly behind schedule and one of things I been looking at was pH. I’ve tested it twice (One of which was 10minutes ago) and it came back ~6.3 both times and I’m fairly certain the meter is calibrated correctly since it returns values within .1ish when placed in a test solution (premixed bought from amazon). I made a hole about an inch deep in two places and took a sample from there. Based on the grow guide from this site, yellow leaf tips are a sign of high pH.
So my attention turned to the soil after being suggested FFOF is to hot for auto. Now I have some new mediums coming for my next attempt but I’d like to keep this one going, at least to keep learning from it if nothing else. Are yellow leaves also a sign the soil is to hot? Or do I need to relook at pH issues? Thanks, pics below