Why did my betta die? I can’t think of anything I did wrong. Water parameters are good, it’s at 79 degrees Fahrenheit. His fins were shredded and discolored, he was blue but he had these grayish-brown blotches. I really have no idea. All the other bettas in his divided are perfectly fine. I checked on him just last night. Either one of the bettas somehow got over and beat him up and went back to their section (which I can’t see happening) or I have no idea. Can anyone help?