Flowering Options?

So I already have my flowering room full but I got a DWC bucket of 6 plants that are getting too big and have to be flowered now. The plants are aprox. 15" and need to be moved because its sativa dominate and gets very tall during flowering. My question is can i set me flouro veg to 12/12 to get them into flowering and once buds appear move them to the flower room. would this hurt them at all? Last time when I put them on 12/12 they showed in 3 weeks. I figure I will cut some clones earlier this week. then after a week I will put them on 12/12 because they Flowering room has another 4 weeks left on it.

that should be fine....but i always tellpeople to feed with some superthrive anytime you do something that could cause stress....

superthrive red? or blue?