One Dead Fish

While Erin is visiting family in South Korea, we are watching her fish. We brought home a big fish tank and three fish. A few minutes after filling the fish tank, we were down to two fish.
Yes, I killed a fish within the first few minutes that it was in our house.
When we were at their house, Erin and Jung-he did say that they thought the fish was sick. They said it was old and they didn't expect it to live much longer. Jung-he said the fish was swimming on its side most of the morning. They took the fish's death with a laugh and a smile.
They were so understanding that I felt worse. I know they didn't expect the fish to live long, but I doubt anyone expected it to die a few minutes after entering our house. On the other hand, things can only get better, right?