Thanks cap, inexperienced grower unfortunately. Got two moby dicks and another unknown grown from found seed. Luckily enough it's female. The burn is more on the mobys. I water every two days, 8 litre pots, in Coco. Fed with canna a b ( about 25/30 ml per L. Booster Plagron green sensation, 10ml per 10L. The area I live in tends to have slightly soft water, but nearly neutral. 5 to 6 weeks in flower. Had spider mites but THINK I have got rid ( used pyrethrum twice, maybe that's the burn?) Hope this makes sense, I'm an old boy who likes a role, not a gardener 😉ðŸ‘