Favorite Tetra!
The Emperor Tetra, Nematobrycon palmeri, is our hands-down favorite. The male has a gorgeous turquoise-blue eye and a fancy 'trident' tail; the females are green-eyed, so it's easy to pick which kind you want. They are a bit larger than some of the tetras, but not as big as the Congo, and they seem to be aware of things in the tank the way smaller tetras aren't. There is a bit of 'chasey' behavior sometimes, but nothing really destructive.