It is probably a Yellow Damsel. I have one also. This site doesn't list them but the "Drs" site does.
Copied from the "other" site:
The Yellow Damselfish, also known as the Golden Damselfish, has lemon yellow coloring highlighted by upper and lower racing stripes, sometimes of neon blue. As it matures, the colors will fade and it will become more aggressive.
A 30 gallon or larger aquarium with adequate hiding places provides a good environment for this fish. It will not disrupt a reef tank or demolish invertebrates. The Yellow Damselfish is a hardy fish that can handle a wide range of tank conditions, as well as tank cycling.
The diet should consist of a variety of meaty foods, herbivore preparations, and flaked foods.