The first Dat I got, 3 years ago, died for know apparent reason yesterday. He measured 13" and was a perfect 3 bar. I didn't realize how big he had grown till he was out of the tank. I have no idea what got him. I left the house about 9AM and when I returned at noon, he was pointed straight up barely breathing. His tail fin was mostly bleached out. No signs of aggression, nothing else matched his size or was aggressive. No other fish have any symptoms. I did a massive water change in case there was an introduced toxin. I still have 4 more that I got as babies at the first of the year.