Magnesium deficiency?

what nutes?

and what are you trying to accomplish with those small buckets barely filled up with river rocks?
 
pH is what you should look at first...most plants deficient in either Sulfur or Iron are deficient because of a pH issue or too much of something else locking out the element/s in question. If you're feeding anything worthwhile your nutrients should have enough micros in it to satisfy any need from the plant, aside from perhaps Ca or Mg (which cannabis have more of an affinity for) Good luck friend.
 
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