What are your conditions, grow medium, and feeding pH & ppms? Looks like nute burn to me but post more pictures in natural or white light, and be sure to share with us the details I mentioned. Sent from my POCOPHONE F1 using Tapatalk
FFOF soil 3gallon pot temps around 81 rh around 68% using a 300 wattshine led with side cfl 300 watt 27000k using lucas 2part formula northern lights auto
My initial thought was be nutrient burn but after some thinking, it looks more like a Potassium deficiency. I've come across multiple threads in which growers used the lucas formula and had a P deficiency problem. I'm not 100% sure though so wait on a second opinion. Other things it could be are Mg toxicity which may lock out Ca, and therefore Mg as well... But this is unlikely from the info so far. Calcium lockout will also cause weak stems which I don't see there. Sent from my POCOPHONE F1 using Tapatalk
It is possible that an incorrect pH can cause deficiencies but if you don't know what pH your nute solution is at, I can't really tell. If its above 7 though, I can see how you'd get the deficiency. Sent from my POCOPHONE F1 using Tapatalk