I was just woundering on something. How long do zebra Danio's live for?? A couple of years or so? Cause I came home tonight from work, and the only remaining danio that survied from predator fish becasue he was to big to eat. Well he was pretty much flouting up side down and swimming in a circle. He has been in the tank for a year and three months. So I didn't know if he was just old and that was his time? or what?