I have had this cichlid for 8 years and it is about 9-10 inches. The last couple of days I have noticed that some of the cichlid pellets from the morning are still floating at the top of the tank. He seems to be eating half, but leaving the rest. Also I should mention that he is acting sluggish and having labored breathing. Is this a disease or is he just getting old? This is the first fish I have ever owned that has lived this long so I am unsure as to what I am supposed to be looking for.