I'm sorry, but I really, really have to disagree with you. Those conditions must just be terrible. What in the world are your water parameters? Eelz212 was keeping two goldfish in a 10 gallon with frequent water changes and the ammonia levels were at .35.
Plus, an oranda grows to be 12+ inches long. In a 10 gallon tank, at full size, he won't even be able to turn around. Allowing a fish to grow in a tiny tank like that means his spine will be bent, his muscles weakened, and if he's later transferred to a larger tank he will not be able to hold himself up and will actually die.
Even if your fish are only 2-3 inches each right now, you've got 12.5 inches of fish in your 10 gallon tank, unsuitable conditions for even the cleanest fish, which goldfish certainly are not. Please seriously reconsider the situation in which you are keeping these fish, and test your water parameters!