First grow plant diagnosis help

Hi everyone, this is my first real (with a legit setup) grow and I just entered flower with my little girl. The strain is Sour Bubba (I think anyway lol), and she’s on day 21 of flower. I noticed some spots and darkening colors on her leaves and thought it was a calcium deficiency, but just posting here to get some feedback. I am open to all advice as this is my first experience in flower! A few details about the grow include: medium is fox farms ocean forest soil, 3-gallon fabric pots, PH’d water to 6-6.8 with botanicare bloom nutrients, 100w Mars Hydro LED, and she is being trained using LST.
 

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