I figured that. I use the same app with their diffuser

If I already had cal mag, I’d use that sparingly. You just want to make sure you aren’t giving it too much calcium in order to increase magnesium.

Again, there may a reason why the magnesium isn’t available or isn’t being taken up. I’ve seen this express itself when the humidity went from 59 to 78. They wanted more magnesium.

The thing…

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Magnesium deficiency shows fading or rust in between the veins (like in the pics)

calcium deficiency shows rust spots as “dots” randomly all over the leaves.

phosphorus deficiency shows fading and/or rusting on the outer edges of the leaf.

Do with that info what you will.