I have a 12 inch black bullhead cat in my 240gal. his mouth is all jacked up like hes been running into rocks over and over again. so i changed the whole setup and made him a hiding space out of driftwood. but hes still jacked up. ive had him for 4 years and i grew him from a half inch baby and i want to know if he is dying of old age (what is their lifespan?), is he stressed, or whats happening. i feed him massivore and market shrimp. Please help my cat!