One I've just found...
I'm selling some tanks I no longer need on Gumtree, just went to browse tanks for sale to see what sort of price range I should try for one of them, and this was one of the first things I saw;
I cannot get the photos to save in a format that will upload here, I'm sorry, don't know how to convert them when "save image as" doesn't work. But it's two large, fancy goldfish in a nano cube, a foot square of space for two LARGE fancies.
The description;
"Moving house and sadly can’t take our fish with us.
Really nice Nano cube tank. A foot square and 35cm high. Comes with an Eheim filter and an LED light.
Fantail goldfish and a black moor included. The fantail is fairly old now so I’m not sure how much longer he will live."
They even call it a nano tank in the title of the ad. It's also pretty easy to move a nano tank that's a foot each side, so the "oh we can't take them with us" rings a bit hollow. Not that I want them to keep the fish either.
Please don't ask me to rescue them. If they were common goldfish I could just throw into my outdoor pond, I would. But I'm definitely not able to house a tank large enough for fancies. But I do feel terrible for them stuck in that ridiculous nano cube.