i don't have tons of experience with t5's, but i have a similar situation on my build thread. and the feedback i have received is to add something like an ati blue+ bulb.

http://www.reefgeek.com/lighting/T5_...rescent_by_ATI

also, would you happen to have pics showing the coloration of the tank. since i am still trying to decide on mine, i would like to see the differences.

~alex