If you want vibrant colour, I would recommend a 20K bulb. I have used XM and Radium with good results. A 250W halide on a 30G would provide ample light.
Also remember many people feel water quality is number one when in comes to SPS colour, closely followed by lighting and then water movement. Stability is very important, and ofter times difficult to acheive in such a small system. I would try and do your best to avoid temperature fluctuation as well, perhaps see if you can get a used temperature controller for your heater(s).
__________________
I'm out. 
|