Hey friend, okay I have seen your grow now and I believe I understand. It would be helpful if you had any information on your nutrition.
It looks like magnesium deficiency to me, and I believe this is caused by your PH being too low. If I have read it correctly you are growing in a soil mixed with coco substrate? This qualifies as a soil grow so below 6.2PH magnesium is locked out and it's really on the line for calcium. I think you should raise your PH to 6.4.