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Magnesium deficiency

Make sure your have proper pH first. Improper pH could lockout nutrient intake. If you're pH is correct (mag is best absorbed between 6.0-6.5 in hydro) you could trying adding a supplement like Cal-Mag.
 
As mentioned above, pH is a major source of issues, but if the pH is fine and you don't have a calcium deficiency as well, I'd use magnesium sulfate, aka epsom salts. Just don't buy the perfumed stuff.
 
Epsom salts is excellent for many issues. Helps correct deficiency and will not burn used many many years. Greens up plants also, excellent on roses.:)
 
I'm doing a DWC grow and adding epsom salts seems to have corrected what I suspected was magnesium deficiency. I add 1 tsp/gallon in addition to my regular nutrients at water change.(flora trio)

I have Cal Mag on order but the epsom salts seem to be working, so I may not switch during this grow.
 
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