For context, Male Japanese pufferfish build exquisite sand sculptures to attract a mate, constantly cleaning up and fixing the mural to make it look as beautiful and artistic as possible. For more information, https://www.pbslearningmedia.org/resource/a-pufferfishs-masterpiece/a-pufferfishs-masterpiece/
I think Splash And Bubbles did an episode about this once. Either that, or Wild Kratts.
I remember an Octonauts episode about white spotted pufferfish 🐡 I don’t remember if it included anything about the mating rituals though.