Welcome to week 4!
I stopped fertilizing. I am fighting a nitrogen abundance. Dark shiny leafs and some burned tips showing in week 3. Could be anything else but i am pretty sure its to much nitrogen. Propably it's slowing the growth rate but as far as i can tell, they are growing pretty well.
I fed them overall just 2 or 3 times with 50% of the BioBizz schema. I think due to the size of my pots (20L) it's not necessary to start using BioBizz products as early as they recommend. Signs of nutrient burn started after using BioGrow and it seems to not get worse after the use of Fish mix.
First week of bloom should be no far in the future.
I use LST on regular basis (2-3 days/plant) and cut some leafs if necessary. I try to keep the plants all on the same height. Next time i'll go with a scrog net.
PPFD: 550-620
DLI: 35-40
PH: 6.5
My light is on 50% power and i will increase it to max 75% in the next weeks. This heavily depends on the growth of the next weeks. If i can fill the tent i'll go higher in power and hanging height to get a better "uniformity" of the light distribution.
See you next week!