Leaf turning Brown at veins and Yellow on tips?

MKJT

Active Member
I have tried to look at photos as to what this may be but all I can think of is Mg Def or Nute burn. If anyone has an opinion it would be greatly appreciated. It is only affecting one plant. I would find it hard to believe if it was Mg Def since I dissolved Epsom 2tsp per gallon of water and have given it twice now (about every 2 weeks).
 

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