Last night he got caught in the tank divider. It was homemade from binders and mesh. He had tried to get to the other betta through two of the binder rings. But he got stuck. I got him out though. His pelvic fins are raggety and torn up. He is missing scales (I think) on his body and one of his pectoral fins are injured. I don't know how but he is keeping it against his side and only using it when absolutely necessary. The other fish is now in a temporary tank. I am going to get/borrow a heater tomorrow, because the one for his tank is in the mail. But help!! Please!! I don't know what else to do and I want to help him get better. Please respond quickly!!