Leaf condition

tips curled up = too hot , colours look like lockout form either ph issues or over feeding , is your water Hard?

Calmag and Epsom have magnesium in them. I wouldn't use both... Just one or the other. What pH are you watering at?

If you are already using cal-mag and adding epsom, I'd lean towards either ph lockout or a potential MAG excess which can cause calcium lockout. It definitely looks like a calcium def, but if you are giving it cal-mag then something is stopping it from getting the calcium you are providing.

They are suffering a cal/mag deficiency, doubling your dosage of cal/mag will help with recovery. The burning is most probably due to not watering to run off each and every time, this helps prevent nutrient salts from building up to toxic levels in the substrate and causing the burning you are experiencing. What is showing in the leaves today is a reflection of what occurred two weeks ago in the substrate, this is why the problem has progressed so quickly. Fixing the problem now will take another 1-2 weeks to show recovery, it won't happen overnight. The older damaged leaves will not recover, but the newer growths should be less affected. Watering just lightly next to the stem is not adequate, watering the whole pot until run off is best, especially in coco/peat. The heavy defoliation you did in early flower won't be good for your results either. Just remember - Less leaves = less energy being made = less growth. It really is that simple! The leaves are the "solar panels" that power your plant, the less "solar panels" your plant has, the less your plant is able to function. I would also suggest 18/6 as optimum and never grow at 24/0, cannabis NEEDS sleep to finish its photosynthesis cycle and to have a correctly functioning metabolism. A plant with an incorrectly functioning metabolism will never produce peak results. The myth that it is ok to grow cannabis at 24/0 needs to be removed from history and could only be recommended by people who don't understand photosynthesis or understand how plants function either. Hope this helps with your future grows. Cheers, Organoman.

Cant say for sure, but seems like it might b overfed or have calmag def. I would try to add calmag lil more