Hi! I can't tell from the photo, but I was wondering how old your goldfish is. Some goodies,I have one Leo, has changed colors thoughout his three years as he grew: he was amost black as a young fish, became almost a pewter, added some black, added some some gold, lost the black and now is a yellowy gold. Most of my other fish have stayed in the same pallet. Perhaps your fish is like Leo!