I was feeding my tank when suddenly my Banggai cardinal got its moth stuck wide open when trying to eat. The mouth is as wide as it could be an now is stuck not being able to swim. I think it tore a muscle in the jaw because I can see a lump to the right side under its gills. Any thoughts it is not looking good. It is still breathing. And yes I saw this happen with my own eyes. Any suggestions or has this ever happened to anyone?