I'd let them get about 12" tall and switch them to flower.
Here's 4 plants in 1 gallon containers. Excuse the yellow leaves. I didn't stay on top of feeding properly as these were plants I think had intended to give to someone and they never picked them up so I just tossed them in the flower tent when they were around 12" tall. 4 plants like these would be about right for a 2 x 2 tent. Good luck.