Whats going on here with these burnt leaves?

Slight burning due to excess fertilizer strength and a slight touch of cal/mag deficiency. Half strength nutrients are usually more than adequate. Remember too, it is very easy to fix a slight under feeding, but very, very hard to rescue a burnt, over fed plant. Hope this helps, Organoman.

Hi there, Deficiency sometimes doesn’t result from lack of nutrient.It may lockout due to improper pH or abundant of other nutrient in that pH.Find out the base cause. As long as you are giving the perfect growing conditions and feeding, they will not go worse.Before you do anything, make sure your water pH, ppm(EC) and run off are in corrected range.Since you are growing in mainly coco medium, keep your pH around 6.0 for both in and out.Always make sure there is enough water run off from the bottom to prevent nutrient accumulating in your medium.Also check both ppm in and out and compare how much they are different.Good luck and happy growing... ✌️