I had a fish a few years back that my mom had bought from petsmart. She thinks that it may have been a tetra but im not sure. It was a small fish that looked clear but it had a neon color in the spine area. My mom was told that a ink of some kind can be added to them and that it does not harm them. Well it actually died a little while after BUt I did have goldfish die before then and didnt know not to add a new fish without waiting a while. Anyway my question is does anyone know what kind of fish this was and is it safe to do that? thanks for the help!