Help me to diagnose my plant

Soil needs a reset.

I agree AN is a bad brand. not that it does not work... but how well it works and the cost point is the big factor. why pay more for the same shit as another brand. almost all the ingrents are the same, just colour and stickers are different. Plus AN has been caught putting PGR's into their feed a few times saying it was a contamination issue and not intended. kinda funny it was not something else but a PGR. shop aorund, much better options out there. and with coir you can go above 5.8PH IMO.

Lockout. Lockout is causing your plant to starve itself and die. The salt build needs flushed. In coco you need to water and feed until runoff of 10-20%.. then check the runoff with a ph ppm meter. Yinmik makes one that's 25 bucks on Amazon. It does EC PPM PH and Temps. It's accurate too. Check your runoff water. If it's ever 300ppms more then your input feeding ppms then your plants about to start lockout. You then need to increase watering to flush even more. But if you run a normal schedule and water until runoff of 10-20% every watering . It is highly unlikely you'll experience lockout. Coco isn't soil, you need to treat it like hydro man. Goodluck growmie 🙏

Man.. 11 bottles? Move on from Advanced after this. I’d personally just run the micro, bloom, and gro or whatever there base 3 are. EC has to be thru the roof

Not a disease at all, just symptoms of nutrient salt toxicity. Waaaay too much nitrogen in general, but feeding 10+ products is never a good thing either.