I'm merging that thread with this one since they are on the same basic set of problems.

Lose the ST entirely. That higher dosage can be applied ONCE and once only- you can't keep at it. You are causing more problems than you are solving with that stuff.

You MUST run calmag on RO water. There's even a sticky about it in hydro because calmag and ro water are major contributors to my carpal tunnel syndrome... :wtf:

It looks like a multi-nute lockout from some combination of N overdose, soil pH, or whatever, and soil pH drops off fast when you aren't running your calmag in your RO water...