i havent used any cal-mag unless its in the bio bloom boost or bio bloom soil nutes i use but to be honest i dont use them much maybe every 4th water i think ill give her a flush and then just use water from now on i think im only about a week or two offLooks like you have a nute problem to me. Once flowering starts you've lost nitogen and a lot changes. Question? Have you been using any Cal-Mag along the way? Might be time to flush are you in soil? Flush check your ph and ppm run off. Clean her out mix up some fresh nutes you can save her. Thats just my thought. Good luck. ps epsom salts around this time of flowering is nice for the yellowing and adds flavor. A little goes along way be careful not to mess up your ppm