bush stopped growing

Raise your temp to 26ish and get your humidity up to near 70. Your root zone is probably too cold to grow new roots.

Hopefully, this helps you a bit: https://www.zamnesia.com/de/cannabis-anbauen

I see that the distance of the lamp is 10cm in your diary; if that's correct, move it to 40 or 50 cm. Second, that seems like a lot of water for a 6-liter pot. I recommend that you transplant to a 10-liter pot and water with 1.5 liters per day. If your grow room doesn't have the right ventilation, your substrate will take longer to dry. You can also water at intervals, water one day and skip the next to give the substrate time to dry. Good luck!

She looks a bit soggy my guy. I would let her dry out as fast as possible and that will definitely help. I would say transplant into fresh soil but she's under way too much stress atm and would most likely not be able to handle it. Hope this helps.

In my opinion, the smaller plant receives more water than the other one? Too much water prevents the roots from breathing, and the plant seems to have problems with that.