Hydro / Waterfarm / Girlscout cookies / need help

Hi guys! I wanted to start the journal after I'm done with my trial and error phase, but it seems not to have worked to my advantage.

I red through many of your journals and copied scotyballs and many others, but regardless of what I do I end up with a very slow grow, that at some point ends with yellow leaves and failure. Maybe my setup is wrong? I tried lower light, harder light, low nutrition, mid and high nutrition, and even soil. Same effect every time ;D waterfarm is supposed ro be easy!

I sport a well designed smart grow box (although a bit short), with great led lights, ventilation and filters.


These are my current conditions (a bit too cold since the cold winter is already here)



Right now, I'm at 18th day since the first leaves.
Pebbles soaked for 5 days in ph between 5.8-6.4 (was rising)
Drip is on 24/7
Seedling was put in the rapid rooter cube (i think thats what its called)

1-10 days - no nutrition, ec 0, ph 6.1
10-14 days - flora nova bloom,ec 0,3, ph 5.9
14- 18 days - flora nova bloom,ec 0,5, ph 5.8

This is my light rotation:
OFF at 23:00 and ON at 04:00


As you can see here, this growth is slooow:
Days 1-5

Days 6-11 (on day 10 I changed the water)

Days 11-18


Lower leaves are droopy and I can see slight yellowning on the leave tops.

Any tips guys on what I may be doing wrong? It should be at least twice this size

Days 19-24

Leaves still drop, but it keeps growing, slowly (i turned it while changing the reservuar, hence the different angle).
EC - 0,5
PH - 5,05

I turned the light up as maybe it was too week. While the plant color looks fine, the lower leaves have burnt tips. Not sure why, the nutrition is quite low, light was weak, ph seems normal. Weird stuff.