sir_isOanswered grow question 4 years ago Kinda the same thing Mrs Larimar said...
You got magnesium excess imo, so basically burn/nutrient lockout/imbalance (of calcium, perhaps sodium and chlorine). Essentially the ionic balance is off.
People often use a bit too much magnesium relative to calcium, and often too much potassium too (though I'm not saying you have too much potassium).
Try some less nutrients (semi-flush), with perhaps slightly raised calcium.