For those who follow these things, I am sad to report that Mr Mustachio has passed away.
He was looking very poorly this morning, swimming involuntarily on his side. The Unnamed Woman noted that this was apparently something to do with a disorder of his swimming bladder. A frozen pea was apparently the appropriate veterinary treatment.
We bought a bag of frozen peas later in the day and one was placed in the fish tank. It would seem this did not have the desired effect.
Before they went to bed, the kids knew that Mr Mustachio’s life expectancy wasn’t very good. They have been prepared for his passing. They might even fight over who gets to flush him.