lol, yeah you can keep them alive for a few months, or maybe if your lucky on a god given chance you'll make it a year, but remember in the wild these animals live for YEARS...not just weeks or months.
if your not responsible enough to have one of these animals and have a proper home for it leave it at the pet store. They shouldn't have to suffer because you just think they look cool.
Get a real reef tank. and support them right.
~chris