I suspect he got in a fight with another fish because I did not actually see the occurrence. However, it never grew back. He was in a tank with other A. Stalsbergi; he was the biggest and most dominant of the other A. Stalsbergi in the tank.
Also just in case you missed the message from earlier, he did not die, I just sold him because at that particular time I was not able to meet his needs, do I decided to sell him because I was so busy with work. 
I was able to get him and another A. Stalsbergi to produce fry. Sent from my iPhone using MonsterAquariaNetwork app
