There is a 20gal tank with a gold color cichlid in it ( I dont know much about these fish) It is over 3 yrs old (Im not sure on the exact age because I havnt been here too long and no one seems to remember how long the fish has been here) He has not been eating well the last week or so and his bright gold color seems to be fading some on his sides into more of a light gold/white color. He usually eats very well, until this week. He has also been spending more time hiding behide his rocks the last few weeks. Is he just old?? How long do the live usually?? or is he sick?? Is there anything I can do?