What could this be from?

hey guys, i started getting spots all over my leaves in certain spots towards the top, some bottom leafs already shriveled and died and look completely like the tips of this leaf. What is this from ???? here's info


tangerine dream
10th week of flower (l14 wk pheno)
advanced nutes iguana juice and other additives
humboldts snow storm, molasses

5gal bucket under 600watt light

10th week of flower... you will have micro nutrient deficiencies. its normal. the females always look a bit haggard when they are getting ready to be harvested. add some micro nutes (zinc, manganese). could be a lil short on potassium as well. but chances are, its a variety of micro nutes that are deficient. if i had to choose 1, id say manganese.

as long as the buds are healthy, then your ok tho, the plant redirects juices from the leaves to the buds.

Its normally on this age ....

what's a good source of manganese i can apply? that was the also what i thought it could be