For some reason this is still happening to this one auto plant!!! I’m at 30" with 3x sf1000 on a 19/5 cycle. It’s not bugs. It’s not heat, the tent is at 74 degree with a RH of 55 Percent. I have not given any nutrients. The water is at 6.4. everything else is still doing fine!
I’m using happy frog.
The new leaves seem to end up with the same issue as soon as they start getting large. I don’t know if you can see it, the plant with the issues. If you look close at the leaf closest in the pic, it has the same look of burn and slight yellow lines in the leaf.