From the youtuber synirr:
“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!”

I love this guy/gal. I’m assuming she has a swim bladder issue and this keeps her properly balanced underwater. Way to go human for helping this sweet little fishy!

He/she even hand feeds her!! Awww. This is how every pet owner should be!