any ideas?
I have this on 2 plants:
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Calcium def
Do you have cal mag and Epson if so add then to your next feed
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It seems like it’s only on that leaf and not the others. The new growth doesn’t seem to have any problems, so I would rule out any immobile elements deficiencies or excesses.
That leaf is dotted almost looks like there was water on the leaf when the sun/lights were on.
If i have to gamble 1 cent I would say septoria.
More pics and more info would help
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This is another cut of it, on the left. the thing in back is an auto that is ready to be trimmed…i didn’t treat it well, but it smells good.
some of the first one i showed, and another of hte same cut next to it. my rh is under control. ~68% but it can swing a little if the ambient conditions move a lot.
they all sort of look bad. the other clone in the tent seem ok. i gave one of the worst looking cuts to a buddy and he planted it in soil and a week later it looked pretty good…it had a bunch of the downward cupped leaves when i gave it to him. he thought the cupping was a root zone issue.
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Looks like it’s all done with the solo cup. Maybe it is needing some calcium as well. I agree with @Papalag that some cal mag and epsom salt could help.
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Calmag is good for everything 
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Calcium is a immobile element. Deficiencies of immobile nutrients first appear in the new growth as the plant was unable to take up sufficient amounts to transport them to the new shoots.
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It seems more like a problem caused by too much humidity but you say it’s quite controlled.
It can also be a radical problem as you say. Either from overwatering or because the pot is too small for her
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I agree it may look like Calcium, but borders then should be affected. When I see just some individual leaves appear like that I suspect bugs, in this case they could be spider mites, I would trim a bad looking leaf and scope the underside, just to discard …
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It didn’t appear overnight, but has slowly progressed over a couple months. This is the underside of two leaves.
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Thanks for sharing, no bugs then, all those spots look inside the tissue so no eggs or frass, consider Calcium deficiency then … 
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A couple months?!? Maybe just transplanting is the best treatment
They don’t look like pests or bugs, those circles look like “burns”.
Anyway it sounds like you had a little problem a while ago. Imo a lock perhaps due to overwatering, or rootbound or if you have done a previous transplant.
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sorry, i don’t know how to keep clones long term. i’m pretty good at cloning, but long term it difficult.
@George thank you sir. it’s always good to hear your opinion. and, i am glad it’s nothing. i may need to send out a cut of this in a bit soon. I hope to get it to someone before i mess it up.
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I also sometimes keep clones for a long time and they have those types of problems but I don’t worry too much, because I only need those plants to carry on the genetics over the years.
I hope that my opinion has been helpful to you even if it is only an opinion and therefore I could be wrong. The comparison with different point of view is always a growth for everyone. Only you can understand or feel which one might be the right one.
Good luck and keep on growing 
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thanks a lot. i actually don’t see very well, so i need help sometimes. it’s ok with a photo on a big screen, but i miss a lot of stuff. i think a few time someone has noticed a seed or some other oddity that has been pretty dramatic. too far sighted.
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