|Hyphessobrycon eques. Photo by Alexander Dubrovsky, released into the public domain.|
[Update: These may not be Serpae tetras.]
Although the fish I keep are generally South American, I have barely scratched the surface when it comes to tetra diversity. Mostly I've seen the long-finned variety in pet stores, and they always struck me as slightly sad, slightly clumsy-looking fish. These guys though are attractive little fish, fairly active in the mid and upper water of the tank, willing to school near (or even with) my Glowlight tetras.
I can't speak for them in the long term, but thus far, I'm happy with the addition.