so my juvenile oscar (just under 4 inches) swallowed my juvenile black ghost knife (just over 3 inches). I didn't expect my oscar to try swallowing a fish nearly as long as him but I should've taken more precaution considering the ghost knife is so thin. The ghost knife is still alive, but seems to have a swim bladder issue along with a good noticeable chunk missing out of the left side of his face. He can't swim right, usually spinning or just reversing in circles, and for now I've moved him to my 20g hospital tank. Is there any chance of survival for this guy? I'm not too much of an expert on treating scaleless fish, but I really love the little guy and I'm fixated on saving him.