I have had my goldfish for about 6 years but for the past month he has not been able to get off the bottom of the tank he isn't eating anything and is just starving to death. Does anybody no of a painless way of killing my goldfish as I have read about various methods and don't like the sound of them. Is there anything I can put in the tank that will finish the poor fella off or do I just have to wait until he dies of natural causes?:confused: