We finally got our 11-year-old goldfish a new tank. Previously he was living in a 10-gallon tank, and we decided to upgrade. I hope he'll be OK in his new, larger home. I used some of the water from his old home to "seed" the new one. I also am using the same filter, as it harbors beneficial bacteria.
We thought we'd put him in the new pond next spring, but I'm very hesitant to do that because there's a heron in the neighborhood and I don't want to provide it with an easy meal of my oldest pet. We thought the new tank would be a nice Christmas gift to him and to ourselves.
The orange fish in the background are fake - they're on the scene we put behind the tank so you don't just see wall.