Hmmm happen to have a syringe around? If you can draw water from close to the bottom of the pot and check ph could help give some insight.
If you ask me it's most likely a watering issue and with the duration so far I'm wondering how compact the media is.
Maybe take a coat hanger and poke from top to bottom starting an inch or 2 away from the stalk.
With watering issues you can always run the risk of wiping out the microbes. They are aerobic an like plants roots need oxygen but also moisture, adequate ph and temps. Both over and under watering can cause issues with them.
Being organic without them or a reduced population you may not have a population produce adequate nutrients.
So when you lift the pots are they light?
Is the too of the soil dry?
You also stated no runoff so I have to ask are you absolutely sure when you water that then entire media is saturated?
Also some concern over if you have any hydrophobic areas if possibly under watering or uneven watering. You should water to saturate and get minimal runoff.
I would suggest a soil moisture meter and press the probes to the bottom.
I'm pretty confident the root cause is watering so nay be worth a read here.
Discuss different watering methods for growing your own weed from seeds. Our community members give helpful tips on how pot size and material, as well as environmental factors affect growing cannabis.
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To know if you need to water your cannabis plant get yourself a soil meter. Poke or drill 4 holes in your pot 1/4 way up from the bottom spaced around the pot...
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And it may be worth some synthetic nutes if you are not opposed.
Back the light up to 30" until you see improvement. Can see signs of high light. I'm ot saying it's the cause but rather they are obviously a bit to stressed to handle it at the moment.
An addition like "
fish shit" or other microbes will help inoculate the soil with beneficial microbes. Not saying g it's a necessity but rather a good option incase the population has been significantly damaged.
