I have a sick rescued catfish who had been bopped on the head. Hes got a damaged lung and labored breathing.he wont eat. The water keeps turning pink. Iv had him in my sink for two days. Please help. What do i do im so worried

My hubby is a fisherman he caught some fish for a friend and one was still alive. Im trying to save him but hes in bad shape. He has a damaged gill and laboured breathing. The water keeps turning pink i dont know if its cause he was bopped on the head and has internal bleeding or from his damaged ...