They could be Black Neon Tetras, but I have never seen them with red in the tail. I have 8 of these in my tank and when I saw the pic that is what immediately came to mind. The stripe description is correct. I would post a pic, but something happened to my computer and now whenever I try and open my pictures it shuts my computer down. Figures.
Here are some links to black neons:
http://freshaquarium.about.com/cs/ch...kneontetra.htm
http://en.wikipedia.org/wiki/Black_neon_tetra