1st timer in coco

i'm 2 weeks into veg, with 9 cheese clones, coco pro, a&B, rhizo,cannazym and pk ,1.2x1.2x2.0 tent with 250 dual spec for veg and 600 dual spec for flower, handwatering, run to waste, (following jberrys thread on canna coco) oh yeah, using tapwater ph'd to 5.8, my babies are roughly 9 inches atm, when do you guys think i should flip these to 12/12? looking for a finishing height bout 3 ft, thx in advance for any help that you could advise. i think this is my first post so go easy on me

First timer? Sounds like a pretty serious set-up to me, very nice! If they can go a bit over three foot if it comes to that, id flip to 12/12 when they are 2' tall