Yes epsom salts can cause issues and you would be well off reading up, calcium is really immobile and mg is super mobile read this first;
Thread title pretty much says it all. Use the charts in my signature line to help with understanding cal mag deficiency, but the gist of it is this: Calcium (Ca) and magnesium (Mg) are two different elements required for plant nutrition. One, Ca, is mostly immobile. That means it cannot easily...
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then read this;
I think I may as well just post these here charts up in their very own thread and then put that in my sig line, because I spend a lot of time posting these charts that I use regularly to help me make diagnoses on all my plants, cannabis included. One is specific to cannabis, the others...
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Also, how far down the plant is this happening and where on the plant is it the most dramatic? I would hit em with some Ca, but not cal mag. Think bone meal... And if you really want to know whats going on a PPM meter will run around 100 bones and will be moneys very well spend, dont cheap out buy the nice one, i have a blue lab and get years outta them before they get funk, and a digital PH meter is much cheaper but still a worthy investment.....