I dont see any signs of lockout bro for either cal or mag. Light can look like mag. My reasoning is this.Ok Aqua we are going to disagree on this one. Go back and look at the leaves one more time. You will see the deformed leaves at the new growth. IMO he needs to do the exact opposite. The plants are locking out because of a lack of Calcium and Magnesium.
Tips curled upwards. The portions that are light like the tips are turning purple and that's anthocyanins caused by high light intensity. The slight bleaching between the veins is light bleaching not mag deficiency. Mag is mobile and will be low down on the plant. CA is semi mobile and will be on the upper portion generally in a spotting pattern.
Oh and the top leaves folding
Just the reasons I say what I say bro.