looks like a classic lock out to me,,the edges of leaves is saying mag,starting from bottom of plant up,cal would work from the viens,,i think you have locked it out with all the nitrogen ,you feeding it,,also you can cause a lock out from lack of air movement,do you have good flow threw the room or tent,several factors come into play ,,but adding cal mag aint gonna do anything but start more problems,,there is reason for the lock out,air is very important and makes the plant transpire at a greater rate making the plant desire the need to exceed,,just my opinion but equal air in and out is a major factor,,think about a outdoor plant for a second,they never have cal mag issues,why,because the air makes them stand at guard all the time for its needs,add extreme temps and humidity in with that,and that bitch be sweating out there and gets to a point were it just shuts down,same looks come on the plant as yours,throw a fan in front of it and new growth is fine,just from a fan if you dig,,this plant sweats just as we do,and hot wind is better than no wind if you dig,,so im thinking cut that n down by half cause it just dont need all that,,you can scratch n into top of soil and water it in,,but make sure you have proper wind flow,,like i said my opinion only,,hope it works out for you ,cause we all need the herb,lmao
