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- fine-ass '22 harvest!
... looks a little cooked to me, but also kinda K defc.-like,... might be the dosage is too strong just now, of the primary nutes, not voodoo/B52,... yes, the nute solution is suppose to self buffer, but it's limited in capacity, and if you tap water is hard, it's getting overwhelmed and not working,.. once in the pot regardless, that buffering capacity is not enough at all for maintaining in-pot pH,... Ah--lights! Too close I believe, which will also magnify the problem! get us more normal light pics, whole plant too please,...
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DH'-- are you using any Ca-Mg at all? I'm kicking myself for not asking before, and some digging around has shown me some pics of more atypical Mg defc. symptoms, which match pretty well with yours,... You really haven't feed that much, so nute burn seems less likely to me, and with that, other minor defc.'s may be acting up and muddying the Mg symptoms,... And with LED light, Mg and especially Ca demands are higher,.. feed at half str. na d for sure get Ca-Mg going ASAP,... if you have it a foliar spray would be the ticket; to make the most of this, you'll need a wetting agent so it coats and sticks far better... A very mild soap can be used in a pinch at this early stage, but the real stuff is best! (I like Coco-Wet best).... Spray tops and bottoms of leaves, keep out of direct light until dry,... it'll take a couple days for things to halt most likely,... pH looks good! 
That's huge man, it clears any lockout issues from the cause list,...
,... by monitoring your inputs for water and nutes making sure they're in proper pH range before they go in (I know what AN says, and I say "trust, but verify!"), and watching your in-pot pH, you can spot trouble well before shit happens,.. prevention is worlds better than cure!
