Wachstumsschwierigkeiten

They're not tiny small! And you did switch to 12/12 when they were quite small. Next time I suggest vegging them another 3-4 weeks and try some lst, very simple to do if you read up on it. Then you will your space more effectively 👍🌱

Doubling up your lights dosen't make them twice as strong either.. it just gives you a bigger footprint at the max ppf.. so yeah drop um!!

https://images-na.ssl-images-amazon.com/images/I/81rtex0DyIL._AC_SL1500_.jpg this is the ppf chart.. in flower plants like as close to 1000 as possible from what I understand.. So according to them.. 12" from your girls in flower 17" ish in veg and like 24 ish as a seedling for good ppf numbers on your top canopy.. you can always tweak it a little one way or the other as needed by what your plant shows you..

They don't look stretched though... ah mars, yeah 18-24 is probably as close as you want due to heat, and monitor from there... footprint is key too. you may need to be higher in some contexts. a photoperiod may need more than a 2.6gallon pot with soil. If you consistently see them stop growing vertically early, i bet that's it.

You have your lamp set at 30 inches on your diary.. in flower you probably should have them ALOT closer. Like 14-16 inches away.. they are light deprived!!! Drop it STAT!!