Yellowing on edges of leaves

Thank you all. I got my hands on a cannabis nutrient deficiency / excess chart. I concluded that it was a manganese deficiency. So I bought a PH tester and added a small amount of the manganese and adjusted the PH to 6.5, for a week or two. I now test the PH every one one I water. Obviously I am not sure if it was the manganese or the adjusting of the PH. The plants looks good and are flowering. I will post pictures tonight.

This might be a cal mag deficiency? I had leaves that did similar issues and added 3tsp Epsom Salts to a gallon of water with good results. Nice part about Epsom Salts is that you can't give a plant TOO much... i.e., there's no worry about overdosing. You won't see results immediately and these leaves may not green-up, but the new growth should look much better... at least, that's been my experience. Good luck!

Again i'm with Roberts on this one, it looks more like nute burn due to dark leaves and the yellowing of the new formation. (the tips) It doesn't look like ph issue because there is no other discoloration like red stems or reddish glow on the leaves. Decrease the ec given and the new formation should look healthier in a few days. Good luck!

Gonna stick with nute burn based on dark green in leaves as a issue for sure. Plus I won't give you a arrogant bye at the end. Good luck

I don't think it is a light burn because when it is the case your leaves are rolling on itself due to too much evapotranspiration. Then burn leaves become white and dry . what i can i see on photo is you have yellow new leaves on your apex and big leaves yellowing. So you have several option now it' s up to you. Hope i helped you. Bye

Hello you have a problem with your PH. Try to measure it when your water your plant. Measure the drain it is the water that stays at the bottom when you water it. Then correct it and wait 5 days to see the change. Good luck. Bye

Looks like it might be onset of nutrition burn or light stress.