Your plants area bit tall but they look really healthy so great job on that aspect. I'd suggest pruning the bottom third to get more out of your light and also increase airflow down there. The bud sites there won't produce much good bud anyway since they are so shaded.
If you're gonna have a veg room at all you might as well have some mothers in there, even if they're off to the side. You'll need clones every 4 weeks.
1x 400w MH will be plenty for that size room.