In 2013, a caring human who goes by the name synirr created a floating harness for her disabled goldfish who couldn’t swim to the surface of the tank due to a severe bladder disease. Using cork and other buoyant materials, synirr greatly improved the quality of the goldfish’s life, especially during mealtime.
My disabled goldfish scooting around in her newly redesigned sling. She has trouble maintaining buoyancy on her own. She looks a little silly, but it is better than lying at the bottom of the tank all day!