Well, my pets are certainly a success. Guppy population has risen from eight to twenty-seven-ish (it's hard to count... they are small and move around constantly). Snail population has risen from somewhere around a dozen to somewhere around crawling nightmare (dropping a food pellet into the tank results in an impressive little mountain of shells rising slowly up from the gravel). So it's official: we've set up a second tank. The guppies are going to be separated by gender to put an end to their promiscuous ways, and the snails... well, you can't stop them. But at least they'll have more land to conquer.
This all pleases me greatly. Just hit me if I start talking about tank #3.