Goldfish Still With Us

"Spotty" as I'll refer to him, is still alive! He continues to swim vertically and will occasionally lie down on the bottom of the tank and then he'll swim normally for awhile, then resume his vertical treading, and so on.

The night I found him on the bottom of the tank, I was prepared to find him floating the next morning. I do down and see nothing, so I assume that Pooky scoopped him, but then I saw him swimming normally and I thought for certain that either a benevolent or malevolent force had been at work! I'd like to think it was the former and not the latter. Anyhow, Spotty seems to have regained something in the way of goldfish normalcy.

He appears to be moving his bowels, and he eats. All of the other fish are fine. Perhaps the tank could use a water change, so I'll talk to Pooky about that. He has been very busy with school and work and so tank maintenance has been awhile. The tank water looks clear and there isn't a build-up of green on the walls, so I don't think the water is bad.

Maybe Spotty is swimming us a message like the dolphins in Hitchhiker's Guide to the Galaxy?