As unlikely as it seems, i think my betta, Beau, hopped the barrier into Edgar's side of the tank, got his ass kicked, and hopped back over.
I found him today completely shredded. He is a HM and his big, beautiful tail is almost completely gone. From what i understand, bettas are pretty good jumpers, and i might have grossly underestimated this ability when i filled the water up to an inch and a half short of the top of the divider. Anyone want to weigh in on what might have happened? I just don't know how else to explain the sudden, shredded fins. Edgar shows no signs of a fight.