Hi Poshey,
I don't really know what you mean by what a pet corn is called. The latin name is Pantheropis guttatus guttatus. A "normal" looking one is a Nominat. If that is what you wanted.
Why not just put a little lightbulb into the tank. Secure it with a mesh basket though. Or alternatively take a desklamp and position it above the tank.
Acradon