On my 2.5 gallon, I use a two-socket incandescent hood that was for my 10 gallon. It has 2 CF bulbs in place of the incandescents. To make it fit, I cut the ends off of either side, shortened both sides, then re-attached the end pieces with silicone. The reflectors on the inside only went so far on each side anyways, and at the width the hood is now, the reflectors go all the way across the hood. Works great and looks pretty decent, too.