How much CalMag should I use for this severe of a magnesium deficiency?
Thank you for helping
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I’m not so sure you have a CalMag problem, but there is something 'off".
Especially with the ‘crispy bits’ on the little leaves below the big one with the white spots.
The lighter green of the top leaves just looks ‘a little hungry’ to me.
My 1st stop would be to verify the pH of your water, what are you running at?
What is your source of water?
Cheers
G
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I don’t think those spots are magnesium deficiency.
What is your medium, what are you feeding it and in what quantities. Also if you do run into a magnesium deficiency I would use some Epsom Salt instead of Calmag. Calmag is just Calcium and Magnesium but if you don’t have a calcium issue there is no reason to add it.
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None. Try litfa instead.
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No water sat on the leaves there. Looks like bleaching where water sits lower. Other than that balanced green light tips but not quite burnt. If on any nutes cut em out is my opinion. pH water a couple times n let dry mostly before watering again.
Did you use Epsom by any chance?
I saw that before, Sulfur OD
I use it in every batch of nutes I mix as I dropped calmag when I went from RO to tap water. I was worried too much calcium would lock out the magnesium.
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PH possibly? Imo that’s what it looks like
Agree, looks like pH fluctuations to me … 
How much Epsom salt would you recommend for a plant in the middle stage of Mg deficiency?
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I feed 1 gram per gallon in veg and 1.5 grams per gallon in flower.
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