LOL, good question
. I don't know. I bought him for 25 cents at a pet store
Good goldfish he was. He started in a fish bowl (I was 10 years old), then moved to a 2 gallon tank, then to a 5 gallon, where he lived his life. He lived in there by himself, I tried to put another fish with him but he killed them off. He was neat, when I put my hand in the tank he would swim right into it. He even moved with me along to Baltimore and back! I honestly didn't want another fish after he died, but my bf's little boy begged me to buy another. 2 more actually Esmerelda and Oswald.
Anyway, I stopped at Petsmart on the way home and talked to someone there. He thinks Oswald is having a problem with his swim bladder. He suggested feeding it only peas for 3 days, and after that he said to start soaking their flakes in the water for a few minutes before letting them eat it. Hopefully this will work.