i top or FIM mine at 8-12" tall, then veg till i have some new growth before moving into closet to flower. im also running about 10-12 plants in a 9 square foot area(very tight fit) with the space you have, you could veg for a couple more weeks with no problems, with just the 5 in there. the plant in the smaller pot in the middle kinda looks heat stressed from the leafs. dont be afraid to top or fim or lst or anything really. it's all part of learning different types of growing. hope that helps, peace.