After 4.5 weeks, we've killed off 3 snails, 6 unidentified small fish, and 2 goldfish. I guess a few too many nights and/or mornings with no food would do anyone in. Last night I got the water ready to go so we could change it this am. Alas, we found 2 floating and sunning their bellies this am. No taps, but we did do the ritual toilet flushing, except they wouldn't come out and I was not about to reach in there to get them! About 3 tank refills later, out the last one came.
I think it'll be a while before we fill up the tank again.