hey i have a 46 gallon bow front with a tiger oscar about 4 inches a 4 inch african catfish and 7 inch senegal bichir. i added the tiger oscar about a week ago and he is always at the bottom.... one day i looked in the tank and the oscar had a big chunk of flesh taken out.. i keep an eye on the tank and he never got bit again but still on the ground never really swimming. he only eats when a piece of shrimp floats right in front of him. he has been this way for 1 week. WHAT SHOULD I DO????? 
Thanks
Thanks