Do plants show overfeeding sontomas?

I think it could be possible that your lights are a little to far away from the plants.

I guess a lack but you have to know how high is your ec and how high has it been in the last few weeks?

Looks like they're possibly "under-watered / root-bound". (small pot size for a long time. (this is how I started off growing!)) What are your watering/feeding habits? With a (small) pot full of roots, you will want to water so that some liquid flows through the roots, and out from the bottom of the pot, ensuring full saturation. - Make sure to remove the excess water from below. Then allow the soil to dry out before watering again.(2-3+ days usually) - "Flood and Drain" If this isn't the issue, then it's likely just the plant shedding under-lit leaves, as the plant matures towards harvest.

Google "Senescence" If it is occurring too fast, keep your regular fertilization schedule... it will slow down this process. You don't want the canopy to be decimated before you harvest, but it will likely fade a bit. You can keep it green the entire time, but isn't neccessary. Just make sure the canopy can do its job through harvest time and color is important to that job.

Hello.. Hope you are well.. No that is perfectly normal and is the plants way of showing u she is ripening and her leaves that have done thier job to photosynthesize have used all the energy in them.. Just snip off any ones that are drying out..they look great tbh so well done.. Stay safe n gud luck on harvest.. 👍🍀