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I’m certainly no expert (but with the amount of problems in My grows I might be soon enough) it’s definately showing a potassium deficiency lower down......Ph is bang on, 6 going in and 6 coming out!
Definitely not a cal or mag issue as i use this due to growing in coco!
View attachment 992297
Above is from the internet.
View attachment 992298
My leaves are darker but the rust spots look the same!
Maybe a couple of better photos and a bit more info might help a better diagnosis? Hope you get it sorted.