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It looks like either a nutrient issue, a ph issue, or both.
The dark green on some of those older leaves points to excess nitrogen, the yellow tips in the first pic look like a mild nute burn, and the missing pieces of some of those blades could also be nute burn. The yellow blotches on some of those leaves and the hook blades on some of them point to a ph related issue.
What are you growing in, and what are you feeding them?
nute deficiency. not 100% certain on which one yet. but i think calcium. i have seen the same thing in my grows. happens almost overnight. i know it's not bugs, i haven't seen bugs in many many many moons. if you use micro try upping the dosage. and if you use regular food...try upping the dosage.
Im growing in a 50 litre airpot ( selfmade)
And just using canna a and b...(.coco)..
My ph tester is wrecked n ive been doing off da dark....its python strain...i had it outdoor for a couple of weeks now i put in tent to flower...1st time i tried dat...
Im going to take more pics tonight...but i cant see any pests...and ph tester not working properly. ....will put more pics tonight...thanks for everyone comments...much appreciated