My water heater is not leaking water. However, the hot water outlet pipe, where it is connected to the extension pipe, has a green and rust colored flaky corrosion building up on the outside. I suspect that this is related to the hardness of the water within our public water supply. The water heater is guaranteed until 2014 with a double anode rod setup. Should I be concerned about the corrosive flakes? If so, what would you recommend that I do? Many thanks!