My goldfish have all come from either Petco's "feeder" tank or from fish my daughters got at carnivals. Question: about a month ago I added 2 goldfish to my pond after a week of quarantine. One was all white and the other was orange with a black stripe down his back. Now the black has almost disappeared. I was concerned that the white fish had disappeared since I hadn't seen her. Late last summer I added a grayish-silver goldfish that I also thought had disappeared. Is it possible they changed color? My pond gets ample sunlight, and I have a good array of plants. A couple of weeks ago I added 3 fish--one was orange, one was orange and white and the third was orange and black. I think the orange and white is turning more orange. It's funny, because I have an absolutely beautiful sarasa (from the "feeder" tank) that I've had since last fall and she's stayed true to color. I have two orange and black fish. One of them was from a Labor Day carnival and he has stayed true to color. He's solid black with some bright orange areas on his head. The orange and black fish I added a couple of weeks ago appears to be staying true to color. Any thoughts or ideas?