Help diagnosing first grow

Hi all, I am attaching photos of my first plant below. She has developed strange dark marks on her leaves and originally thought calmag would solve the problem. That didn’t work so here I am asking for more advise!
 

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I don't use botanical so I can't advise dosage. The plant though needs more, make sure your ph is good. All the nutes in the world won't help if ph aint rite.
 
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