What's up with these leaves?

[chevyrestore]

Hey guys, doing my first grow right now. I bought 2 healthy clones, one sour jack, one superman og. The leaves have started to look different and not sure whats causing it. I'm using organic soil, water ph at 6-6.6, 30-10-10 nutrients but about 1/2 strength.

 

[lexort420]

Well im no expert but my guess would be either nute burn or you need some cal/mag. But hold off until someone else chimes in cause I am not a 100% sure