Nute burn, calcium defiency or magnesium deficiency?

Yo everyone, currently come across what seems to be a slight issue in my grow, just entering 6th week flowering (i believe..) this coming monday, and things have until now always seemed to look pretty healthy. I mean I think i had a little nitrogen abundance in early-mid flowering which gave me a few dark green leaves and some clawing, I put this down to this being my first grow and not yet knowing the best nutrient regime. So since then I began flushing the medium with a very low nutrient solution , which was quite a task due to the fact im growing in autopots so was having to remove from the bottom feed trays into buckets to flush , these plants are quite bushy so it was quite difficult, but yes , and i also filled up the autopot reservoir with a very low nutrient solution . After the clawing slowed down , I added some pk 12/13 to the reservoir but no coco part a & b ( in fear of overtoxicating with nitrogen) to make sure it had the nutrients it needed to bud. Now about a week has passed and i've noticed these brown/rusty/grey/crispy patches come up on some of my leaves and i'm unsure of what it is. After looking on the net some people have said it may be a cal or mag deficiency , so i've taken it upon myself to add two teaspoons of epsom salts to the 20l of nutrient solution in there and also added 10ml of a and 10ml of b , just to try and support any micro element defiency it may be experiencing... Do you think i've done the right thing? or is my problem just nute burn?

I'm growing two blue cheese , one in soil one in coco, and one cheese plant in coco . The two coco plants are in the autopot system , but i top feed the soil plant myself, I got it seperately and mid cycle .
 

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hellraizer30

Rebel From The North
You can have to much nitrogen i.e dark leaves and cause cal mag issues or vise versa! Something to think about
 
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