I just purchased a common oscar from an all tropical fish store here in AZ. No fish in the tank that i chose from appeared sick or anything disease wise. The oscar i got kept ramming itself into the side of the bag on the 20 mile drive home. By the time i got him home he was just lieing on the bottom of the bag. I acclimated him to my tank water. I placed him in my tank and he just sank to the bottom. He hasnt moved much in 24 hours. I did walk in the room to see him swimming at middle level. As soon as he saw me he dropped back down to the ground again. He has been faintly breathing ever since. Does anyone know if he may have knocked himself stupid by hitting the side of the bag?