Well you have to make a decision on whether you’re going to top or LST.. If you’re not in a rush, I’d recommend topping, give them 7-10 days to recover then flip to 12/12 IF that’s all the tent space you have to work with.
That’s gonna be a tight space to flower 6 plants, so you likely don’t wanna wait too long vegging them out or else you’ll be seriously outgrowing that space. Good luck!