Bubbleponic hydro Ice nirvana

im going to be starting up this kit
with Ice Nirvana seeds
i will most likely be planting inside of a sliding door closet
the kit holds 8 gallons and is 13-14 inches high
im only going to grow 3-4 plants at a time

how HIGH/tall do you think ICE NIRVANA will grow in this kit?

Should i get different nutrients than what they offered me?...if so where from and what...
lighting:

one is a vegetative light and one is a flowering light
both are 42 watts 2800 lumens 7 inches long
i just use both at same time though
(150 watts incandesent?) pretty sure

i have started germinating 2 in papertowels and the white sprout came out should i put it in rockwool now? and should i soak the rockwool in nutrient before putting seeds in???
any help thanks