400w mh

hi ive had my church under the 4oow mh 4 nearly 3wks from seed its fem greenhouse.its currently just the shoots 4 the fifth node,the nodes are real close from the 1st,shud i veg it 4 another week?how much taller will it get wen i go 12 on 12 off?also i couple small rusty specks on leaves wot cud this be?last 3 days started givin it my vitalink growth feed with rhizatonic phed 6.5

spots sound like they may b due 2 nutes,

ur girls will normaly grow 2 2 x their size or a lil more when swithched 2 flwr.
u should keep this in mind if u hv space limitations if not, well biger plant = more smoke, however more wrk as well just b sure u hv the rm

havent got a problem with height so u think another week?the little first rounded leaves are yellow and startin 2 die off so i gave them weak nutes last couple days.is it good 2 hav close internodes?

any1 got any ideas?

any1 got advice plz