Not only water temperature but also hardness and oxygen. There are a lot of metals an minerals in regular water that could kill a fish. Also is he's kept too long in a plastic sealed bag it he may not get enough oxygen.
Well, I had 9 goldfish, the regular kind. Over time, about 4 was eaten by their mates, who then proceeded to die of indigestion. There was enough space, food, oxygen, you name it. They were just dickbags.
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