Hey Fatnasty
He leaves in your pictures show very dark green color, which is a sign of nitrogen excess, and the burnt tips/edges suggest nutrient burn. In flowering, this often goes hand in hand with a potassium issue either a deficiency or a lockout caused by too much nitrogen or incorrect pH.
Here’s what you can do:
Check your pH and EC if the pH is off, nutrients (especially potassium) can’t be absorbed properly. Aim for 6.0 in soil, 5.8–6.0 in coco/hydro.
Reduce your feeding strength the plant is showing clear signs of overfeeding. Try lowering the nutrient dose and see if new growth comes out healthier.
Consider a flush with pH-balanced water if EC is too high, then reintroduce nutrients at a lighter dosage.
Focus on bloom nutrition in flower, plants need more potassium and phosphorus, and less nitrogen.
The damaged leaves won’t recover, but the goal is to stop the issue from spreading. Keep an eye on the new growth that’s where you’ll see improvement.
Keep us updated 😊