Burmeseanswered grow question 4 years ago Hi Bro, I am pretty sure because I have that kind of situation.Mostly high pH substrate and excess use of Grow nute cause Nitrogen Toxicity and Nitrogen Toxicity causes other nutrient to lockout.I get rid off that by giving pH adjust plain water with alot of run off like flushing and remove the excess of Nitrogen and salt build up in the medium.After that, I carried out proper feeding and came back to normal.If you can’t water until run off, for me, I don’t see any other options..... ✌️