Don't you hate posting a question and nobody answers? You start to get a complex after a while! ("what, do I smell bad or something?")
Anyway how is your Oranda doing? I noticed that Black Moores will actually, as they mature, turn orange. I don't know about Orandas though. Aside from the scales turning color, are they, the scales themselves, normal-looking? How does the fish act in general? Somewhere in cyberspace there has to be a fish troubleshooting site or page. Good luck!