Whats next?????

Ok so i am about a month in to my vegging....an d I was wondering if I should be doing anything to my plants. Obviously I am a newbie and am up for anything......I was thinking of topping one of my plants but I think they might be too tall....is that possible??

The Rundown: I have 3 OG Kush plants they are in 1 gallon pots as of right now until I flower them. I have them in a dR100L tent which is roughly 3ftx3ftx6ft. I have them under a 600 watt digital ballast with reflector and MH bulb (HPS is waiting) I have a carbon filter and exhaust fan and a DIY co2 setup.......I am using Jack's Classic nutes too

What I am wondering is if I am doing ok or if I should be doing something to them tohelp them grow. The biggest one is 11 1/2" and the smallest is 9 1/2" tall...........

you could top but i personaly like to l.s.t it allows you to veg longer and keep them shorter
but so far you are doing great

put them in 5 gallon buckit then start lst as soon as they recover form the transplant

after about 2-3 weeks of lsting
flip'em

looking great, keep it up,
ive been tiping but im changing to LST next grow, lookes like a good idear from all ive read.