If you are not digging the yellow you definitely want to get fluorescent lighting. You can purchase specialty fixtures from aquarium stores but really any 'energy saver' bulb will do, even those from the hardware store. It is usually easy to get your hands on a screw-in CFL (compact fluorescent bulb) that you can simply screw in where your incandescent bulb was. I prefer the shape of the Coralife Mini Compacts
because the spiral bulb format is very inefficient. The full-spectrum lighting the bulb puts out is suitable for growing plants and will also enhance the color of your fish.