Lime green plants.

Looks like she need potassium

Looks like a potassium defecency to me

personally, I think you are in or close to a lockout. Looked at the diary the temp is too high should be 24 - 28 in the daytime. increase the PH to about 6.2 and your PPM to 1100. At this point, CalMag is your friend. best of luck

800?! They should have 1500ppm! Add npk now :)

These are severely lacking in nutrients. Most notably nitrogen. But I would up my feeds significantly.

I've done some reading on calcium deficiencies in coco and think you'll find this article very helpful... https://www.cocoforcannabis.com/needcalmag/ It specifically says you should be adding calmag to ALL your irrigation throughout the whole grow - have you been doing this? It also talks about what calmag does to your EC readings and how you would need to adjust your other nutrients because of it... Do look through the article, I think you'll find your answer! Good luck...

Hi there I would add a NPK booster they look hungry to me.. Best of luck 🌱