I’m probably wrong but I might see thrip spots on some fan leaves. Worth a check under the leaf for the little buggers. I don’t see much yellowing really.
Hey @Jambo15 -- welcome to Roll It Up !! I zoomed in on the leaves and see the same thing @Bobby Long Buds does. There's an interesting article over on GrowWeedEasy:
could be magnesium, pH, also maybe looks environmental. is it hot? does the pot/soil have good drainage? get it up off the floor if you can. need a few more details.