Henry Kim has 20 goldfish whom he adores and does everything to make them happy.
If you know all the fishes have a swim bladder which helps them stay upright in the water and doesn’t let them go down. If they have some problems connected to the swim bladder they will lose the ability to float to the top, eventually dying.
So when Kim noticed some health issues connected to swim bladder he found the solution. He searched for some facilities that would help the fish and finally found some “wheelchairs” (as he called them) for his fish. They helped the fish to swim easily and make them forget about their health problems.