That's real interesting...I've got leaves curling just like on 2 plants (one more than the other)and I though it was heat stress. My temps have only spiked at 28c but are more of a steady 23c-25c, its been baffling me. Do you think I may have the same problem...i don't see the same coloration on the leaves as what you got there...well you've seen what i have got... did you correct by just upping the feed ?
I was running about half my normal Cal Mag and about a third less nitrogen on a couple plants. I could see my other plant, I don't even know the strain, was suffering and I was thinking to myself I'm going to make some adjustments with my next nutrient mix. By the time I made the adjustments my other plant looks terrible and this one I could see the first signs of what looked like a standard Cal Mag deficiency. Mainly a few scattered rust spots and I could see some lightning, yellowing where the leaves should be greener.
So because of all this I was able to diagnose it relatively easy as under feeding. I'm really trying to get a feel for these autos, I believe they grow faster slightly N deficient. But, I obviously i left them a little bit to long. It has helped me get an idea of how much N is in the calimagic and micro.
I'm not too sure about those Sawtooth Leaf edges. I wish I could go back and retroactively pH test my nutrients and see if the pH stayed stable. I'm confident that I've had good run off and haven't over fed.
I've decided to get even more run off for awhile as that seems to help in coco.
As far as your leaves go... It's a harder call. Your leaves on the affected plant seem to be very dark green and not quite waxy. The spots could be several things all minor and simple or you could be on the verge of a significant imbalance.
My memory has been trying to put together all the symptoms into a coherent diagnosis, but it's sometimes easier when they are worse off.
Your symptoms
Intervenal chlorosis, necrotic edges and green waxy(almost) leaves.
All those symptoms together and worse would be an exotics nutrient lock out issue. Can't tell unless it gets worse.
Or a slightly over N feed with some minor nutrient issues. I recall you're getting good run off, but you may want a little more. With a reduction of N if you haven't already.
Then you can search those three symptoms and start to panic[emoji32]
Although, I don't think it's a serious issue
