Bruce is back!
Not only did I not kill him during last summer's fish-sitting extravaganza (unlike the two goldfish I acquired by more direct means and promptly dispatched by some means I still have not been able to determine),
he's still alive and finning!
I love having Bruce over. He's so friendly - swims right up to the side of the bowl when I turn up, and flaps his fins excitedly at me, even if I'm not about to feed him. Also he is very very pretty, and it's ages before you have to change his water, which means I never have to do it at all while fish-sitting, (which is probably good news for his longevity; the Other Two fish were fine until I changed theirs.)