Coco growth

[Luisdayuso]

I’m currently growing the LSD strain I’m using coco plus perlite 2x2x4 tent with 600w I’m at 12 hours day 12 night i am using the fox farm nutritions. How ever I notice several of my leaves are like the one below can anyone recommend a solution this is my first grow can I pull the leaves

 

[Nunyabiz]

Needs calcium, I assume your pH is about 5.8 or so?

 

[Luisdayuso]

6.0

 

[Nunyabiz]

Thats probably OK, as long as your pH pen is accurate.
Add some calcium