4 month

I'm really amateur, this is my first plant! I used Critical feminised seeds (RQS) and 50 w cool white 6500K led panel. This is my 4 month old plant and it is 25cm only. I used RQS Easy Boost, 15 liters of good soil, the watering is OK and the led working 24/7. What's the problem? It's ready to...