Alot of people are running 2x 13 watt pc's. What are you fragging?
If you dont have an auto top off I would strongly recommend one, you get alot of evaporation on these little tanks.
Also space might be a concern depending on what fragging, corals with sweepers etc.
How are your lights going to mounted? in a canopy? or in a fixture?
you can find alot of good deals online for retro fits. But I really couldn't find any fixtures that would fit my tank, and allow room for my equipment.
Here is a pic of my lighting being mounted/ installed in my 2.5.
I am running 48 watts 3x13w 50/50's and 1x9w atinic. I have my ballasts installed in a wooden ballast box next to my tank stained to match.