Given the information available so far, I'd suggest that this is a symptom of improper pH.
Do we have any idea about the EC/pH of feed water? What soil, any amendments to buffer pH? What's the wet/dry schedule, are you going off pot weight when you elect to water? Temp/humidity of space?
Do we have any idea about the EC/pH of feed water? What soil, any amendments to buffer pH? What's the wet/dry schedule, are you going off pot weight when you elect to water? Temp/humidity of space?
--- Right, notice how I didn't say anything to you about the Schultz! ... I did say something about the "sterile media" though, so WTF are you talking about with that?? You haven't addressed that yet, twice now... And when you start out "advising" with gibberish, you get ignored or called out on it-- no I'm not talking about the video,.... His reply to your first post was OK, because that was exactly what he got out of it,... it wasn't a troll response either, this is his thread, and he responded as he read it, as did I... have you thought about how you phased that? It may not have been meant as snarky, but sure as shit reads like it.... 
Where the hell are you getting this from when there is no info yet about the cumulative inputs and dosage strength?... There isn't the least sign of Zn defc., BTW, right?-- or anything but Mg so far... Did you notice I said "if", proposing the possibility of too much high strength feeds/supplements, pending more info; early symptoms on several defc.'s and even toxicity can overlap with others, so more info needs to be had first! ... You, are assuming, and we all know the wise saying about that, don't we?! You trespass when you interfere with nonsense, or with arm-flapping indignation like this! 
.... Plagiarism 
--- I'm with Nammy, looks mostly like Mg defc. to me,... N defc. can start out looking like this, but usually it pales-out the whole leave fairly evenly, plus that food is pretty N heavy,... In fact, I'd stop using that Schultz food too, 10-15-10 is not a good ratio for cannabis, and the specifics of the formulation and sources are not good either,... foods like this often drive the pH too low in-pot! Epsoms are great, but as it's a salt, it's not the best long term solution, besides it has no Ca in it, just MgSO4 (S is great too though!),.... how much per gal are you using, ditto for the molasses? This is good stuff too, some Ca, Mg, K and a little Fe in there,... But, if there's heavy nute salt build up in there starting, it will interfere with other nutrients' uptake, including Mg... from the looks of the other leaves, this might be the case here,.. get us a whole plant pic please, and the other info,.. what soil is this, do you pH adjust the nute solution, and water (if needed),... I suspect a flushing might be in order to purge the excess salts,.. we'll see!
that got out of hand quick.......
