"Cal mag" isn't even a word... It's not a deficiency, or a sickness.. It's a marketing term used to sell a product. Unfortunately this will keep happening until you learn how nutrients work, and how they work/react with other nutrients.
If you are using a name brand bagged coco, there is no reason to add more.. Bagged coco is pre buffered with calcium because if the cec ratios. I've been working the infitmany posts for a couple of years now... I've seen maybe 3-4 plants that were actually deficient.. 9 out of 10 times the issues are caused by a lockout, due to an excess of something.. 8-10 times, its too much calcium.. Calcium is a SECONDARY nutrient.. That means it's not needed in heavy doses or regularly.. So your coco has calcium already in it.. More is added when you use mega crop.. Then more calcium, plus magnesium when you add calmag... Too much calcium in the medium will make magnesium and phosphorus unavailable for the plant to use.. Too much magnesium will make calcium and potassium unavailable for the plant to use.. That's what you are seeing on your plants.. 3 or 4 different issues caused by a lockout. If that's bagged coco, flushing it probably hurt more than it helped due to the calcium buffer.. Read up on coco cec and calcium for more info.. Coco is, in my opinion, an advanced medium.. It is unforgiving, and you have to know you stuff when it comes to feedings. I told myself a few years ago that I would not say another bad word about mega crop because so many people get defensive over it.. but in my honest opinion, is that it's not a good cannabis product. The npk ratios are way off and so are macro nutrients.. I know 3-4 people total that can grow healthy plants with it, and they are all in hydro setups and they had to find there own ratios and feed rates..
Nutrients have to stay in balance.. Once there is an excess of something.. Issues start to show up... And with autos there is zero recovery time.. Once an auto is flowering it's full steam ahead.. You won't be able to correct leaf spots because the plant is no longer focused making or maintaining the leaves. I would say stop adding calmag (forever, like, never use it again, lol).. If for some wild reason you ever need calcium.. Add a source of calcium.. If you need magnesium.. Add that.. But adding both when you only need one, has never and will never make sense to me.. I'd reduce the amount of part A or B that you're using (reduce whichever has the most calcium and magnesium in it). I hate saying it, but you goal now is to try to get to harvest.. It won't be cute, but there isn't much you can do to correct this at this point. It would literally take a soil test or lab test to tell us what nutrients are out of balance.. There's a thread in the mega crop section that is hundred of pages of exactly this kind of issue.. Everything looks fine in veg, then bam.. The roof gets blown off.. I hate when people get discouraged, so next grow, tag me or someone in the journal early on! I'll help as much as I can..
