4th Week of Flower and out of Nowhere

I am in Coco using Canna nutes. Im in 4th week of flower and all of a sudden i get this shit. It looks like a phosphorus or zinc deficiency. Any advice will be appreciated. I got leafs that feel like paper are yellow starting from the outside and have the claw.

Looks like you need some calmag.

YAY! Micro elements... Give her cal+mag. She looks like a bit overwatered too.

Whats the temp/humidity in your room look like?

Temps stay between 76 and 80F. Humidity has been about 45 lately