New plants, same spots!! What am i doin wrong?

[Lebnator]

Hey again

Room: 77deg F/65%rh
DWC, 5 gal. Buckets, 15 L water
Plants: all autoflower, various stages of development, all flowering.
Nutrient: HOG 3 part (grow/micro/bloom) basically same as general hydroponics, but with a little bit higher concentrations I think, Feed at about 3/4 strength of their chart
Additionally: Regent-a-Root @ 1ml/L
Hygrozyme@ 2 ml/L
H²O²@1ml/L(every 3 days)
PH 6.0-6.5 (usually drifts up)
EC .9-1.3 (usually drifts down)
Well water is filtered then uv treated. Comes out of tap about 140ppm/ph 9

Skunk:
2 weeks into flower, still stretching a bit

Jack Herer:
Maybe 30 day flower done stretching

Unknown Genetics:
About 60 days into flower (more to go)

Also this one seems to have really dark leaves (N tox?) Compared to the one underneath it

Any help would be greatly appreciated. Seems like all my plants end up with this issue, early to mid flower and am never able to resolve.

 

[NorthernOrganics]

Looks kind of like mite bites...

 

[Dtraderbudz23]

I find asking people for advice on here about plant diagnosis is a crap shoot. Could be this, Could be that. Just need to learn by trial and error and that's something that only comes with experience.

 

[TomH]

Looks kind of like mite bites...

Not that I have much experience to draw from, but this was my first thought too! Zed, we've got a bug.

Look under your leaves, might need a magnifying glass.

 

[justinsloan]

I am pretty sure it is Leaf Septoria. It is a fungus and here is the possible solution, I would recommend an anti stressing agent first though possibly if you have alot of pruning to do. https://www.growweedeasy.com/cannabis-plant-problems/yellow-leaf-spot-leaf-septoria#:~:text=Sometimes%20called%20“yellow%20leaf%20spot,bottom%20leaves%20of%20the%20plant.

 

[justinsloan]

Amazon.com

This is not bad for an anti stresser.

 

[Dialitin420]

I didn't see cal mag in your regiment. If you are running RO water it is imperative to add it. I use 5 ml per gal. There is a chance this might bring them back. If non RO water it would probably be less than 5 ml.