Thank you for your comments!
I have relatively high temps in the growroom (especially now during the heatwave), so i decided to try this CO2 technique, and it seems to have helped a bit. I won't invest more in it, as you munki wrote it's waste of effort. But i like to experiment, as this grow is mostly experiment for me, i don't expect a great yield mostly due to the problems i've encountered while the newest one being that the timer broke (damn)
Thanks Mr! How long did you flower your G13? These girls have shown their first pubes this week, and i would hope them to be ready by the end of september but i don't know if it's too optimistic..
Btw, the sourcream mtoher i have looks more like a indica-type than the one i have in flowering chamber. Pretty weird? THey are both grown from seed tho so phenotypes could vary.