Man, I would add the new lights when you go to 12/12. CFLS do great for Vegging, are easy to move, have LOW HEAT, low energy use, and do just fine, and can be as close as two inches away fromt he plants. look at my pics under Grow Room Setup, under R for Roseman. I started with 2 85 watt CFLs and now have 6 total for the Flowering stage.
You need to add two airstones to inside the tank to add oxegen to the water. I've done several experiments with OXEGEN, and air stones and you can not add too many. OXEGEN is not discussed enough as being so important.
I started out draining my tank every 14 days the first month, then went to every 7 days and learned that the draining process allowed more air to get to the roots. Now I drain as often as possible,e ven if I add back teh same water and nutes. Those ten minutes of the roots being dry make a large difference. DO NOT EXPOSE THE ROOTS TO LIGHT.
AND get a spary bottle and add 1/10 the normal amount of nutes to the water and sprayt he heck out of them. remember, naturally they get rained on and wind blown.
You ought to also visit my thread STEALTH HYDRO BUBBLEPONICS here, I assure you that you will learn a lot there..
Peace