HELP ME PLEASE!!

looks like you aren't watering entire substrate based on a couple of the pictures. Make sure entire volume gets wet with 10-15% runoff waste. Once you get that normalized, re-assess. Symptoms could be due to bad watering habits - dry pockets have swinging pH and nute contents. wait for top layer of coco to change color before irrigating again.. Always fertilize in soilless every irrigation. Adjust feed based on observing plant. Always get 10-15% runoff. This ensures pH consistency, nute consistency and helps prevent microbial growth and pests infesting your substrate.

In coco, ph needs to be 5.5 to 6.0 with 5.8 being the best for very cycle. From sprout, you can feed at 400 ppm 0.8 ec and increase by 100 ppm 0.2 ec if you see good growth every week until you reach 800 ppm for photos, and if their autos, you stop at 600 ppm. Make sure to water until you have at least 10% runoff and check the ph and ec levels