Colombian Tetras

[benzonar]

Does anyone know how many different forms of Colombian Tetra there are.

I picked up six from an lfs yesterday which have a clear dorsal fin. Picked up another 6 today and these have a distinct yellow dorsal fin.

Look great and I wonder why more folks don't have them. They are like mini oiranhas when it is feeding time, extremely quick.

 

[jollysue]

I don't know about Columbians, but all my tetras feed in a frenzy, some more than others. Are they different ages? My lemons didn't develop their bright yellow caudal (?) fin until adults.


EDIT: Anal fin?

 

[Lateral Line]

A hungry fish is a healthy fish.