Regular flores will only give your tank enough light to grow algae. Power compact or VHOs will simulate sunlight and give your fish better color and allow light waves deeper into your tank to grow corals and such. Your tank will look much better if you have a white bulb as well as a blue acitinic bulb. Just keep in mind the vho will cost you almost 10 x more!
Sorry for the newbie question - but do you need a special ballast such as the icecap to run VHOs? Also how many bulbs do you need for a tank? There are 2, 3, 4 and even 6 bulb models. I have a 46 gallon bow front and I don't plan on ahving more than just anomes, feather dusters and some mushrooms