As I write this, Sarah is swimming around her tank doing this weird swim forward, stop, back up and then swimming forward again. She's also being doing some dolphin diving.
On Monday I found two parasites on her which I had to scrape off with a knife (disgusting). I now think that Speckles may have brought the parasites into the tank and they may have been what killed her, not Sarah. I've been watching Sarah closely to see if she has anymore and so far, so good other than the crazy swimming and her obsession with the hot tub.
On top of all this the tank seems to have developed a slow leak.
Goldfish challenged is a bit of an understatement at the moment