Our fan-tailed guppy died today.  She was the only surviving progeny of a group of five that I bought almost two years ago, three of whom disappeared and two who died, all within a couple months.  Frankly I was surprised they survived long enough to produce fry, but there she was, swimming over in isolation with KeithRichards.
I suppose there are hardier fish I could keep, but I really do like the live-bearers.