Bugs or deficiency?

Noticed a few leaves developing these spots on my Critical Jack, at first glance I thought maybe mites, but from what I've seen these are bigger spots and I have checked top, bottom, flashlight, affected leaves, unaffected leaves, didn't see anything with the naked eye and can't find my loupe. I did see a couple single strand webs but I'm pretty sure I found the culprit as seen in the last photo.
What's weird is that every affected leaf is on one plant. I have 8 plants in 4x8 scrog, I wouldn't imagine they'd confine to one plant.
Opinions??
Starting week 5 so I don't wasn't to spray anything if I don't have to.

More pics with lights off

That little spider is not eating your plants. He is probably eating what is eating your plants. I strongly suspect spider mites. Look closely at underside of leaves for eggs.
Another possiblity is thrips but from the spots I would say mites

EvlMunkee said:

That little spider is not eating your plants. He is probably eating what is eating your plants. I strongly suspect spider mites. Look closely at underside of leaves for eggs.
Another possiblity is thrips but from the spots I would say mites

Click to expand...

Yeah I didn't think he was eating the plants, just making the web. Do fungus gnats bite leaves? I have been noticing a few. I looked all around after the lights went out, shining through leaves, couldn't spot any signs

The plants look great, a little cal mag and maybe a couple aphids on there, if you see lady bugs then you probably have aphids. Those bastards can smell aphids from outside the window I know I had a problem with aphids, till I filled the room with sulfur vapors for 2 hours. Spiders are good they eat things that eat your plants.

Dr.4:20 said:

Yeah I didn't think he was eating the plants, just making the web. Do fungus gnats bite leaves? I have been noticing a few. I looked all around after the lights went out, shining through leaves, couldn't spot any signs

Click to expand...

Cpappa27 said:

The plants look great, a little cal mag and maybe a couple aphids on there, if you see lady bugs then you probably have aphids. Those bastards can smell aphids from outside the window I know I had a problem with aphids, till I filled the room with sulfur vapors for 2 hours. Spiders are good they eat things that eat your plants.

Click to expand...

I had noticed a bunch of those spiders hanging out down low and have been leaving them alone, figure they were a good ally. Haven't noticed aphids but very well could be. My main concern is nipping it right off the bat if it is mites. Assuming it was, what would be safest at 5 weeks?

Dr.4:20 said:

I had noticed a bunch of those spiders hanging out down low and have been leaving them alone, figure they were a good ally. Haven't noticed aphids but very well could be. My main concern is nipping it right off the bat if it is mites. Assuming it was, what would be safest at 5 weeks?

Click to expand...

Do a sulfur burn its the cheapest and easiest and you can do it right up into 6 weeks of flower without any residue or flavor change in the buds. Dont start spraying and using chemicals chasing a possible problem. Since I found out about sulfur I never used a spray again, it kills everything except the plants.

Very cheap and easy, kills any mold that may be around too. Scrape off the first inch of soil on your pots and then cover with plain sand it will prevent any shitheads from laying eggs and choke out any eggs that may be under there.

Would it take care of thrips as well? Pulled a few of the worse leaves so I can monitor if it's getting worse, found nothing on any of them except one, I believe it to be a tiny dead thrip but couldn't be sure

the red spots on top of your leaves is calcium deficiency, the other spots do look like spider mite damage.

Roger A. Shrubber said:

the red spots on top of your leaves is calcium deficiency, the other spots do look like spider mite damage.

Click to expand...

It will kill them too yes.

thrips are actually pretty decent sized, you would see them easily if thats what it was