Magnesium Def Noticed Advice Needed

have had a problem with my plants yellowing and dying off have looked up on nutrient def and toxicity and pics of mag def and it was like looking at my leaves as to treating this it says about using epsom salts i have never used epsom salts before and do not wish to sound like a simpleton does this go in your nutrient feed or do it have to be put in seperate any advice would help cheers

Are you sure it's a magnesium def? Can you post any pics? I have a strain that is a magnesium hog in flowering but requires no extra in veg.. Epsom salt works ok but if you can get your hands on general organics calmag I have found outta ALL calmags and supplements out there that this stuff works the best outta all of them.. Take my advice and go with the GO's calmag and you'll never have this problem again.. Good luck bro