- If you're growing all organic then any pH-ing needs to be done organically as well. 'Normal' pH-up and -down will mess up the soil biome that you've worked so hard to nurture which in turn takes care of your plant, so keep that in mind. In a healthy organic grow using tap water in a normal pH range, you do not need to do anything to the pH of the water going in.
- Good that there are no bugs. Keep a very close eye on pests, especially with your cover crop you have since that can allow them to hide, reproduce, and then eat your leaves and roots.
- The watering regime seems to be off for this stage of growth. Usually, by Day 22, I would be watering 5-6 cups per plant in my 7 gallon fabric pots (for reference, 1 cup is about 240mL) every 3 days. You're currently at about half of that. How does your soil feel? Is it dry at the top or soggy? Do the pots feel light or heavy? A good rule of thumb is to take a handful of soil and squeeze it into a ball. If the ball falls apart when you let go, it's too dry. If it stays together but falls apart when you gently poke your finger in it, it's just right. If water leaks out like a sponge or it doesn't fall apart when you poke it, it's too wet.
- The focus on watering is because under and over-watering show similar symptoms. Also, the watering regime affects everything happening in the root zone including how healthy your soil biome is which affects how the roots can take in the nutrients in the soil.
- All this to say that if watering regimes aren't under control, it can be a nutrient uptake issue. In synthetic nutrient grows, this is often due to a pH issue at the root zone but in organic grows, it's more often due to an unhealthy soil biome (the soil biome being all the great fungi and bacteria you're taking care of which in turn take care of the plant).
- Speaking of soil, what kind are you using? I couldn't find it in any of your posts, so sorry if you mentioned it previously.
In summary (thanks for reading my thesis if you've gotten this far!

):
- It is likely a combination of a watering issue and a nutrient uptake issue.
- These two things are often intertwined and the input that you can control is the watering regime so I would put my focus there if everything else is dialed in.
- Nutrient uptake issues in synthetic grows are often due to pH issues, whereas nutrient uptake issues in organic grows are often due to an unhealthy soil biome since with most sources of water, a healthy biome will buffer the pH as needed. (If you do decide to pH your water, make sure to do it organically as well using lemon juice, vinegar, etc as synthetic pH up and down will kill the microbes in the soil.)
Hope some of this helped and that your plants get back on the road to being vibrant! They don't look too far gone, so keep the hope!