could be a nandus nandus, has the common name 'marble datnoid', which could explain why it came in labeled as a datnoid.
picture and discription in this thread http://www.monsterfishkeepers.com/forums/showthread.php?t=227845&highlight=nandus&page=9
picture and discription in this thread http://www.monsterfishkeepers.com/forums/showthread.php?t=227845&highlight=nandus&page=9