Whats wrong with my cannabis plant?first grow help

0k so this is my first grow and my leaves started getting like these rust like spots on them. I'm around 4 weeks flowering.and some leaves are curling up.you guys got any idea on what this is ive looked it up and i think its calcium deficiency just wanted a second opinion.heres some pics hopefull y my baby can be saved

Go to ur local grow show and get som cal-mag,add it to every feeding untill u start to flush,try putting this ? In the plant problems section,there's som good advice in there

thank you its my first thread so i had no idea were to put it

looks like nute burn

ph water anything over 6.0 flush with water and cross ur fingers

This looks like it could be light burn. I just got this myself. If it is then move the plants away from the light to a distance that doesn't not feel uncomfortable to the back of your hand.

R u giving them nutrients? If so how much r u feeding them