I started watering more and adding a normal amount of Biobizz Bio-Grow.
I continued doing some LST and on Day 24 I chopped the 2nd and 3rd leaf-pair.
Day 25 I decided to Top the plant.
On Day 26 I accidentally chopped one of the new coming branches, which made me really mad at myself. So the whole purpose of topping and getting 2 new main buds was gone.
But things like that happen, so I decided to make the best out of it and just continued.
On Day 27 I added an additional weight on the plant, to hold it more down to the ground. Still I need to be careful and limit the height of the plant as I have very limited space.
@Zarayju, Sorry for the late answer, I was not checking here frequently.
I've bought those from Lientec-LED. They also offer a lot of DIY-Sets. Keep in mind to also order some aluminum profiles, as the heat of the LEDs needs to be dissipated.