You can see one of his ventral fins is stubby. I don't know how exactly happened, but about 3 weeks ago I found him quite beat up, swollen mouth, bump on his head, and broken fin. Best I can figure is he tried to jump and hit the lid, hard.
Also, if anyone knows lots about bettas - his mouth has black around it and is slightly lopsided. I think it might be complications from his accident, but I want to make sure it's not some other sort of disease. He's otherwise acting normal - begging, eating everything in sight, and flaring at the ladies.
My current theory is that maybe he broke his jaw or knocked out some teeth when he injured himself. I read that on old bettas when they start to loose their teeth their mouth can turn black (Mango is quite young though).



