A hearty thank you to Mad Cat Lady and Ramon Insertnamehere for their excellent suggestions of fish monikers.
Not only were the names they offered excellent in and of themselves, but I also suspect Rosalind, Orlando, Marx and Engels would make for a thoroughly good night out.
But the naming rights of our newest family members have been awarded to Squib who suggested Anna Karenina and Count Vronsky. Hurrah!
Not only is the suggestion of inevitable death appropriate for anything fish- (or plant-) related in my house, but we already have Anna's train, ready and waiting for her final leap!
In a crazy example of life imitating art, I can see now we were just waiting for 'Anna' and 'the Count' to drop into the tank.
So thank you, Squib; now I owe you for the Darwin badge AND the fish names.