My concern that his passing would mark the end of the world on my windowsill turned out to be unwarranted. Whether through slow-maturing eggs in the tank, parthenogenesis, or (I suspect) extra eggs included in the sea monkey food, the current population of Wee Water World is at least 3 or 4, and possibly more. I added some new water to compensate for evaporation, and as a result there's a lot of "stuff" floating around. I'll check more closely on Monday after things have settled.
'Course, now I'm starting to run low on sea monkey food. What should I do when that runs out? Order more? Drink 'em? Try to teach them to hunt on land and eat my cow-orkers? I'm open to suggestions here.