24" HO T5 bulbs are 24W so with 2 you have 58W, and for what color spectrum to choose it is to some extent personal preference, also what you want to keep. And the 3W per gallon is a good guideline as well, but again it depends on what you are keeping.
If you are looking at Giesemann bulbs the 11000K Aquablue Plus are a brilliant white, the Actinic/Blue Plus are a bright blue (similar to Aqua Glow bulbs by Hagan, if you are familiar with them) and the Pure Actinic 03 are almost like a black light, great for dusk to dawn lighting or for highlighting coral/fish colors.HTH
Quinn
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