the first pic looks like spider might bites the second i have seen before can you take a run off ph test and a ppm it doesnt look bad look under the first leaf would you and see if you see lil tiny tiny moving thingies??? it still looks healthy but we can see whats going on from what i just asked to do.. hit me up im pritty sleepy but we will get down to the bottom of this.. also i want to ask you if thier is any knats flying around??
K so just just checked it sorry its in flowering but i tried to wipe it off and it is not powdery mildew so could it be a spider bite and if it was a CA def. it would get better soon just did a nut. change today
well i think you either got it under control the only way to know is look at the new growth if its green and healthy than you already fixed the problem... always look at the new growth that will tell you how your plants are progressing..
Don't worry to much about it, I had this issue in soil on my first growth as the soil was to high in organic components, as soon as plant was about a foot high it just started to take off, and as said above new growth is important to watch