I'm trying to remember the name of it... I do know it's not aquatic and it will eventually die in your aquarium. I fell for it twice before I actually identified it and researched it. I'll see if I can find it again for you.
I think I found it:
Aluminum Plant (Pilea Cadierei)
So I was in the China town area, went into a aquarium shop, saw this really really unique plant and bought it. Sadly when I googled it and found that species is not a true aquatics!! Oh well there go 5$.... Should I leave it in?