I'd be more concerned about putting my fish in shock with cold water.
jlnguyen74;3288602; said:You may think it's a good idea to use warm water, but it's NOT!Think about the corrosive and all kind of unknown chemical, debris inside of your water heater tank that could be harmful and toxic to your fish.
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Think about the corrosive and all kind of unknown chemical, debris inside of your water heater tank that could be harmful and toxic to your fish.