Trying out new nutes (Jacks 3 2 1), having an issue

I am trying out jacks 3 2 1, using jacks, calcium nitrate, epson salt, sea green hydro and silicia. These are veg plants in coco ph has been between 5.9 and 6.1, have been getting jacks for about a week now. This is starting to show up on a few leaves. ideas?

You've got a lot of good looking leaves there. Unless this 'issue' affects half of the leaves on the plant then I'd stay the course.