4 weeks in bud.Need Help

My upper leaves are turning brown and rusty colored.brittle to the touch.using humboldt soil and AN ph perfect? I think its needing cal/mag but lookking for other suggestions. Thanks

gotta post pics bro than ppl can help you

Pictorals please.

^^^^^^^^Yep, pics but no doubt you need cal/mg....not sure what else is wrong.

Thanks guys!! im at work right now will grab some pics at lunch