This is Alexial when she was young and chubby. She's a deathstalker
scorpion, Leiurus quinquestriatus.
In normal light she looks like this, though in the following photo she's all grown up:
You should NEVER leave a blacklight on a scorpion long-term. The intense UV rays will eventually kill the nocturnal animal. Some pet stores market scorpion habitats with blacklights because they look cool, but they don't tell you the facts.
Here she is featured at UglyOverload.com on June 24, 2007:
and here, at The Gist, on Smithsonian.com: