It looks like you are giving your plant too much light and burning it.
I'd recommend that you hang your light at 75-90 Cm.
Plants really doesn't need that much intensity at early stages.
Happy growing chief ✌️
@Lion25, yeah mine had a really rough start. Almost died in soil, transplanted into coco, then 2 weeks later had major Cal Mag def, had to defoliate majority of leafs. But shes a strong one sitting at 40 cm , done some LST on it and now buds looking good.
Never heard of cuttimg popcorn first. I normally cut thr main and top colas and leabe pop corn a week more
@Charbs,hi man, good luck! I had a potassium deficiency, all of a sudden I watered with water for a week and my ph in the soil rose to 7.5 suddenly I ordered the ph down biobizz which arrive this Friday and today 'hui I cut popcorn I post photos I hope I have done, someone could tell me if it is better that I cut all the popcorn?