Right now no one is sure what it is. It was imported a few times back in the late 80's/early 90's but hasn't been formally described nor has been found again in the wild. Most consider it a synonym of facetus, but I don't think it is for two reasons. One it stays a much smaller adult size and two, it's body shape is much more elongated than facetus or your specimen. Coloration is very differant too, but coloration is not supposed to determine species at all appearantly.
But Camphilophus I think tracked some down, so I would yield to his word on it.