Plant not growing in height

Hi there Matriosky, sorry but i have to disagree with my esteemed colleagues here, you have calmag deficiency as you can see from the yellowing on the serrated edges of the leafs starting with the newest growth first (immobile nutrient) and in between the veins starting at the base of the leaf. It's specifically magnesium deficiency. That's probably because of your intense light schedule : plants just need more Mg with strong lights or long schedules. So what you can do is to increase the calmag you're already feeding as well as to make a spray with calmag 1-2 ml / L and spray twice a week to compensate for the lights. If the problem persists you might need to reduce the light schedule to fix the root cause. If you do this the problem should stop spreading quite quickly and the plant should recover in around 10 days or less. Hope this helps ! 🚀