Oh I wish I would have become a legal caregiver as it was an option in 2012. Instead I was greedy and it cost me a little. 3200 lb is all I seen, lol. Yes I had a job and I still work for the same company, 25 years here.
The yellowing and brown on the bottom leaves, it’s hard to judge size from a picture, but it should be a lot bigger for 8 weeks.
last but least, it just don’t look like it’s thriving, let alone happy. Cold roots?
Ok then. You need to leave it in there longer than 10 hours, it will turn around.
Just so you know, that plant has been struggling for longer than the 10 hours it seen from your led.
That plant is struggling for 2 months old. Looks over watered. 18/6 is easier on them than 24 hours veg. I couldn’t get 24 to work. It will adjust to your light, might take a couple days.
Sounds like you need a new co2 controller. Correctly working equipment is important, any way, Co2 in dark will not hurt them. My veg room gets co2 for their 6 hours of darkness.
I cut, dip into clonex gel, place in foam puck in cloner. I use clonex cloning solution in the water, it helps but not a must. I’ve cloned many times with straight water. I do ph around 6.3. Always 100% success.
Get a ezclone. I get 100% every time, no dome, don’t need to worry about humidity. When they root plant them. I used to run a 48 site with same results. Now I use a 9 site, cause I flower 9 at a time. Today’s. Rooted under 18/6