CalMag, right from the start, thru 3 weeks before flush, last 3 weeks, just mag bro. calmag u want 150PPM ---- THEN add other nutes. Over watered, and over feed. Nitrogen toxic. Flush, 3x pot size, dry out, 250PPm calmag every 4 days.
calcium makes the leafs pull to the side, i see a bunch like that. Definitely needs the mag also, im just saying, at this stage, cal and mag is a must,
when you have a few plants, and only 1 is messing up, its usually either calMag hungryier then usually pheno, or root problems