My worst thing with goldfish was getting home one day and finding my 2 goldfish in my cats bowls. My cats had picked them up from their tank, and taken them to their bowls to eat them. 1 was long gone, but the other looked intact. Dry, but like a fish. I put it back in the tank, and after a few mins it started swimming. It probably would have survived too, but I medicated it to death. I got 2 more, and a lid for the tank.