My Glo Fish Has The Shimmy's

[tararizer]

I dont know what to do. Water change was done in my 10 gallon. Only 5 glo fish. All has been well. No changes. And now one of my glo's the shimmy's. Almost looks like it's ceizing. I feel terrible and I dont know the best way to put it out of it's misery... what do i do?