First off, let me say..."welcome, fellow newbie"

Are these sativa's or a sat mix? Looking ok to me.
Personally, I'd cut back to 18/6 lighting.
What, with tying 'em back they will bush-up more, but when you put them under 12/12 lighting, sativa's generally stretch 3-4 times their height. (1 foot tall going into flower, 3-4 feet tall when done, depending on strain, size of pot, type of lighting for flowering...)
Speaking of which, are you planning on using same lights for flowering?
HTH...Rusty