Week 6 of flower with a fan leaf issue

It is a scary time my bruce banner plants are in week six of flower and most of the large fan leaves on one plant are looking yellow and spotty.The rest of the plant is looking healthy and the buds are filling in. Does any one recognize the problem i am having? I have scoured the internet and youtub and no luck so far narrowing it down. Oh and the cuts out of the one leaf was mechanical not related to the issue. Hate to lose all my Bud


thanks for any assistance.

Looks like nute burn and the yellowish leaf looks like possible phosphorus deficiency but you for sure have nute burn that’s why all the tips and brown and turning up

Well thank you I have just finished a thorough flush with ph'd water just minutes ago just in case i had someone i showed pictures to saying it was a fungus so was really worried. See in a few days i suppose.