My goldfishes tail was bitten off by a Black Moore. It has been about a week and it doesn't seem to be growing back. He can't swim properly and can't swim downwards. He also can't get his head to the top of the water so just isnt eating. The past day He has just been swimming in circles face down. The tail stub is now bent in one direction. I've tried putting him in a bowl where he can reach the bottom to get him to eat and have also tried had feeding him but he isn't interested. I moved him into a new tank the second I realised this had happened.