Potassium deficiency?

Hey Skipi007! It definitely looks like the start of a potassium deficiency, but given those dark green leaves and burnt tips, you’re likely looking at a slight nutrient lockout rather than a simple lack of food. Even with runoff, salts can build up in coco and block K uptake, especially now that she’s mid-flower and her demands are shifting. I’d recommend checking your runoff EC to see if it’s spiking and maybe dialing back the base A + B nutrients just a touch for the next few waterings. Your pH is perfect at 5.8-6.0, so stick with that and she should stabilize quickly. She’s a beast of a plant, so just a small tweak should keep those buds happy! Happy Growing, Growmie!