A " regular fluorescent light " like a 40 watt 4 ft. shop light or ceiling fluoresent light is fine for fish only tank. Would look crapy over a tank unless you custom build/mount it in a hood ect. The white bulb may not suit your taste so the flouresent bulbs that they sell at any LFS will work and give you a choice of colors. If you retro fit one in a hood just make sure the connections are safe from water splashing and keep an eye out for rusting parts. Fish dont really care about what kind of light there is as long as the something so they have a day and a night. Reefs are when you need special lights mainly because of corals need for special lights.