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- fine-ass '22 harvest!
... true'-- you've been feeding lightly, in uncertain soil, so the likelihood is that this is a simple lack-of defc., not a pH lockout (no other signs of that so far at least).... in small pots like this, it's easy to get nute salt build-up, so watering to say 10-15% run-off helps keep moving excess out,... such early symptoms can overlap with others, so sometimes we have to wait a bit and see,.. making the wrong "correction" can make matters worse,... a few days should show something 
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'Scotsman-- 
Cheers mate! ... OK, diagnostics is damn difficult at times, there's so much to learn, especially by remote like this, which is limiting no matter what.... Many things are directly connected, but often overlooked... cause, vs. symptom,...it can get muddy real fast!-- but you always start with basic info, and the pics....
-- leaf curling/bowing, "canoeing", edge rolling, tip claw, general deformations,... hint at different things, some very specific like tip claw, always N toxicity,... Edge rolling, "teeth" tips pointing up, something minor curling (on live tissue at least) are more likely to be environmental; any bad combo of low RH, high T, light intensity/heat proximity, overly strong air movement can cause water stress, not at the roots, but at the leaves-- transpiration related,.. It all flows from the roots up, water and nutes, the plant cannot select which, it all just goes,.. high transpiration rates happen to keep the plant cool, and these above parameters can force things to go beyond what the plant can handle,... nutes can over-accumulate and cause often confusing symptoms; past a point, the stomata will close up to stop catastrophic water loss, and the flow grinds to a near halt... this can cause minor temporary nute defc.'s, or worse-- leaves stop cooling and start to roast and die! ...... Water stress, N-tox, odd growth patterns can make leaves bow down, canoe or cup up, etc. , so again, deciding which is in the details,...
About nute defc.'s, where and how they manifest, there are general trends, but not always consistent.. for example: P defc can show nearly anywhere, even though it's mobile (true of any of the mobile nutes); it takes energy to move nutes, and the plant's own "wisdom" can have it take it from closer mature fan leaves, rhather than pipe it all the way up from the bottom leaves.
A word about that: nutrient mobility refers to in-plant translocation from established tissues to new growth, not during initial uptake; immobile/ poorly mobile nutes can't removed from tissues once established, so in this case, symptoms will start with new growth always; Ca is a confusing one, as symptoms often occur midplant, hence the wavering about it being slightly mobile vs immobile,...but many of the micronutes- Fe, Zn, Mn, etc. are immobile and show on tops first and worst,... In this case, the symptoms don't look Mg or N specific enough yet, but fit K defc. best-- almost always, K defc, and toxicity, will hit at the teeth first,.... the deep color might be N abundance related, or from weak light,...but some color variation in plants is normal, and camera/computer alterations can be deceiving,...barring no other signs of N-tox., write it off as any of the above,...
break time... F'ing workin' me here! 
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'Scotsman-- Cheers mate! ... OK, diagnostics is damn difficult at times, there's so much to learn, especially by remote like this, which is limiting no matter what.... Many things are directly connected, but often overlooked... cause, vs. symptom,...it can get muddy real fast!-- but you always start with basic info, and the pics....-- leaf curling/bowing, "canoeing", edge rolling, tip claw, general deformations,... hint at different things, some very specific like tip claw, always N toxicity,... Edge rolling, "teeth" tips pointing up, something minor curling (on live tissue at least) are more likely to be environmental; any bad combo of low RH, high T, light intensity/heat proximity, overly strong air movement can cause water stress, not at the roots, but at the leaves-- transpiration related,.. It all flows from the roots up, water and nutes, the plant cannot select which, it all just goes,.. high transpiration rates happen to keep the plant cool, and these above parameters can force things to go beyond what the plant can handle,... nutes can over-accumulate and cause often confusing symptoms; past a point, the stomata will close up to stop catastrophic water loss, and the flow grinds to a near halt... this can cause minor temporary nute defc.'s, or worse-- leaves stop cooling and start to roast and die! ...... Water stress, N-tox, odd growth patterns can make leaves bow down, canoe or cup up, etc. , so again, deciding which is in the details,...
About nute defc.'s, where and how they manifest, there are general trends, but not always consistent.. for example: P defc can show nearly anywhere, even though it's mobile (true of any of the mobile nutes); it takes energy to move nutes, and the plant's own "wisdom" can have it take it from closer mature fan leaves, rhather than pipe it all the way up from the bottom leaves.
A word about that: nutrient mobility refers to in-plant translocation from established tissues to new growth, not during initial uptake; immobile/ poorly mobile nutes can't removed from tissues once established, so in this case, symptoms will start with new growth always; Ca is a confusing one, as symptoms often occur midplant, hence the wavering about it being slightly mobile vs immobile,...but many of the micronutes- Fe, Zn, Mn, etc. are immobile and show on tops first and worst,... In this case, the symptoms don't look Mg or N specific enough yet, but fit K defc. best-- almost always, K defc, and toxicity, will hit at the teeth first,.... the deep color might be N abundance related, or from weak light,...but some color variation in plants is normal, and camera/computer alterations can be deceiving,...barring no other signs of N-tox., write it off as any of the above,...
break time... F'ing workin' me here!
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)... I've been grinding here over 2.5 years now, and still have tons to learn, and gain actual experience with,... hydro, coco,... but even so, one still has to bone-up on things to be able to help out,..What I don't know, I say so, and find those who do! ... I had plenty of learning help from others here, and still consult with my Sensei's when needed! 
