Yeah, I wouldn't say its overcrowded but there definitely isn't room for another. The tent is actually 40"x40" so thats another 16 square inches from 3ft, and its 78" tall. They are about 7 weeks into veg under a Mars II 900 LED light hanging roughly 24" above. I feel like their growth has been a bit slow but that is at least partially due to some watering/aerating issues. They were in 3.5g buckets before but I started noticing some phosphorus and calcium issues, which was either from overwatering or lack of venting, so I moved them into 7g smart pots a few days ago.
I've seen other grows with plants twice as tall by 5-6 weeks, but these are rather bushy and started from seeds (3x Amnesia Haze, 1x Pakistan Valley, 1x Berry Bomb), so I'm not really sure how far along they should be relatively speaking. I'll probably do another 2 weeks in veg, let them roots grow into their new home, then start my transition.
