help needed

i have 2 plants growing at the mo they are big bang and grapefruit. big bang is about 4 " tall with good growth about 6 leafs in all the grapefruit was a bit slower so to speak its just put out the 4th set of leafs but still small my set up is 400w dual spec lighting i have about 90 90 120" in sq feet temp is about 79 when the fan is on but a lot higher when not as i dont have a the right amount of timers to do it all so i do the light my self and the rest comes on at every 45 mins for 15 mins. 5 litters pots with soil no fert has been added yet as i put some fish blood with the soil when made up the ph of the soil is 6.7 i grow big bang in the greenhouse in the summer so it did its own thing i got about 20 oz of dried bud 1st grow as well 2 plants that was they were mosters.
when do i veg them plz help if u need any more info just drop me a line

what do you mean by when do you veg them, as it sounds as if your vegging them now.. all veg is is the time after they sprout from a seed, till the time that you flip them to flower.. some people like to use 20 hours of light with 4 hours of dark, and others like the 18/ 6 schedule.. that part is really up to you..
depending on how much height you have in your grow area, will determine how long you let them veg for.. myself, i have plenty of hieght in my room, so i like to let them veg till i see one of two things, if not both. .. the first is uneven nodes, or where the branches come out of the main stem.. at first, the plant will put them out evenly.. one on either side of the main stem, but as it gets closer to sexual maturity, the branches will start to come out unevenly..
the second thing i look for before flipping to 12/12 for flowering is preflowers.. you will either see two small white hairs, a female, or a cluster of balls, a male.. once i see the preflowers i like to switch to flowering light schedule..

forgot to mention that a plant will atleast double, or even possibly triple in size from when you put it into flower, depending on what strain it is, so you will have to take this into account if you don't have much height in your room..