Leaf problems

I disagree with the nutrient burn hypothesis. Reason is that there is no sign of leaf tip burn and they are not turned downward. Additionally, your plant is not excessively dark in it's colour. To me, it looks like Calcium and Magnesium issues. I come to that conclusion based on where it's happening on the plant (mid to upper) and, if you look closely you can see small necrotic spots here and there on the leaves. As well, you can see the beginning stages of chlorosis between the veins of your leaves, which in advanced magnesium deficiency will look like yellow stripes. The large blotches of necrosis can be a result of over watering damage. Remember, Cannabis plants like soil on the dryer side. They grow in naturally dry climates, Mexico, Afghanistan, Morocco, Africa, India. So they don't like soggy soil with no aeration. Keep your pH in acceptable range. Anywhere between 5.5 to 6.5 for Coco/Hydroponic, and 6.0 to 7.0 for soil/peat Conclusion, Pick up a bottle of Calmag. Every nutrient company has one. Follow it's mixing instructions and water with a pH of about 6.2 Calcium is very available at that pH. Mix a gallon of water with the recommended dose of calmag. pH your water to 6.2 and flush the whole gallon through it so you have lots of runoff out the bottom. Let the soil dry out. Then resume your feeding routine but start adding the calmag along side it. Or, you can alternate your application, so one watering is fertilizer. Allow soil to dry out, then water with only calmag, and alternate that routine. always making sure your pH is correct. Hope this helps and solves the issue! Best of Luck!

The images you provided show signs of nutrient burn, which occurs when plants receive an excess of nutrients. The tips and edges of the leaves become brown and crispy. Considering your concern about using too much fertilizer, nutrient burn aligns with that observation. To address this: Flush the Soil: Water your plants with plain, pH-balanced water to help flush out excess nutrients from the soil. Reduce Nutrient Levels: Cut back on the amount of fertilizer you're using, and ensure you are following the recommended dosage on the product label. Monitor pH: Double-check the pH of your water and nutrient solution. Fluctuations in pH can affect nutrient uptake. Observe Plant Response: Keep a close eye on your plants for any improvement or changes. New growth should show healthier color if the issue is being corrected. Remember to gradually introduce nutrients back into your feeding routine to avoid shocking your plants. Your grow diary on Grow Diaries provides a helpful overview, and fellow growers in the community may offer valuable insights as well.

I would say you either have a deficiency! Leaves yellowing from bottom up normally means deficiency not a toxicity. Yes you do have slight burn on tips of top leaves. But it looks like a deficiency problem of Nitrogen and calmag to me. Also PH. Definitely could be out of wack. Please check runoff ppms and PH. If your PH is out of wack it could show us all kinds of weird things that make you think it's something else. Check runoff ppms this will show you if your toxic and leading to a lockout or if your deficient and need more nutes.. i would say the latter. Please consider selecting me as the answer so I can be entered for a chance to win grower of the month contest I would really appreciate it 😊 🙏

I agree to you, leaves darkgreen/- tips burnt, and it looks like you did not hit the richt PH