Leaves 3-dimensional and outlined dark green?

Does anyone have any experience with this? The leaves are like thick and full but they're ridged? And crispy. I dont know how to describe it but it's like they've gone 3 dimensional. And then obviously lighter in the middle and dark in the veins and outside. Thought it might be magnesium but I don't want to add anything until I feel more comfortable about my diagnosis. I'm running crop salts.PH between 5.8-6.2. +/-1500 EC . The crazy thing is I have another plant in coco doing the exact same thing on a much larger scale. Same strain. Ive got this one in this shared tub which I now see is probably not best for everyone involved so I'm going to move into a solo dwc but I still need it correct her deficiency / toxicity. From now on if they're going to be sharing a tub they're going to be the same strain.
 

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