Ok l0r, um

Aswell as the things listed above, definatly, at some stage, preferably when your plants are less than 1ft tall, start Low Stress Training (LST)

FIM/top your plants, that will promote more cola growth thus making much bigger harvsest...

In my grow, i've just started FIM (today) and will be doing LST in a bout 2 weeks. My 6 plants are under 180w of flueros, and are about 3" tall.

hope that helps/..