It seems to me, the plant is growing rather slow. I've been increasing the lights on duration to 16 hours inside the tent (goal is 18, but not too fast), due to my G13 x Dawg Haze being already harvested.
Maybe the light is too strong, as i have put the plant outside the tent after 12 hours to increase lights on time. I will increase the height to the lightsource today. Light seems OK, But i forgot to water it, as i had a stressfull week. Doesnt seem too severe though.