What's wrong with the plant thanks

Nutrient burn. Also major stress from living for weeks without sleep. 18/6 is optimum for all cannabis plants, both autos and photoperiod strains in vegetative growth. Nothing on Planet Earth can function properly without sleep, cannabis included. Cannabis needs sleep to undertake certain metabolic processes that it can not do during lights on/awake time, meaning your plant is suffering from incomplete photosynthesis, possibly contributing to the nutrient burning. Go to 18/6 and ease up on the feeding for a while until she recovers. You will know when she is happier, the new leaves will be fine and not burnt. Hope this helps, Organoman.

Nutrient burn usually leads to lockout. The edges browning is k deficiency. Probably due to lockout. Flush. When you feed again use half of the nutrients. I also suggest getting a grow book. You can look for solutions and you will have a better understanding of what people are suggesting online. Most people online are learning to grow. Helping others is a good way to learn. Happy Growing.

" She's on 24 hour... " Metabolic stress and dysfunction.

Looking like a case of nute burn. Too higher level of nutrition for the plant. There is nothing you can do about the damaged leaves, you will have to now keep your eye on the undamaged ones to tell if there are still problems. Give it a good flush with ph water and when you start feeding again back off your nutrient to about half then slowly increase it over time.

Hi mate, looks like a calcium deficiency to me. She will be struggling due to the light being on 24/0. I'd recommend giving her some cal mag and also dropping lighting down to 18/6. You can do 20/4. But I believe 18/6 is the optimal lighting for autos.