What kind of tetra is this?

I can't find my camera.. I took some unwanted fish from a friend today, 4 black neon tetras, 3 silver tip tetras, and one I cannot name or find online. Its the largest tetra I've had, long skinny shape like the others but the length of 1.5 of the other full grown tetras. Its about 1.5" long. Bodys all silver/transparent like a black neon or a glow light tetra, but with no line or color on it. Its tail has the ONLY distictive feature on it, the tail splits into two sections like most do, both of which are white with a black stripe on each. I'm at a loss, and also don't know what else I can describe.