I used to have a tank full of goldfish...and now I have a tank full of hatchetfish & glass catfish. Goldfish are supposed to live long, and some do, but mine just kept dying. We tried everything; diet change, water change, gravel change, etc. Nothing ever worked.

BTW~ Thanks to some helpful information, we have figured out that Kelsey has Swim Bladder Disorder, and that he is not suffering (pain-wise). We are making a complete water change tomorrow, and are going to change his diet. I'm glad we found out what he has, and that it is treatable.

P.S. I'm sorry about your goldfish