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First, find out if it was really the heater that killed the fish, Petco employees are know to lie to avoid giving a refund and most of them don't know anything about fish or about caring for fish. Always do your own research. To keep the tank warm without a heater, you can warm up the room slowly until you've got the target temperature in the tank, then just keep the room at that temp. Always have an aquarium thermometer in the tank and check it often to make sure the temp is right with or without a heater.
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