Last time I was using ffof soil and watered with a ph of 6.3-6.5 in veg stage I had lots of problems. After a month I dropped my ph wayyy down making it very acidic. You should test the soil run-off. I have mothers in ffof and water with 6.8 and is doi g great. Also transplant wouldn't hurt. But the guy to ask more about this is rustytrichrome. He is a ff guru