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Originally Posted by Lincs Yellowbelly Some goldfish do just stay black but in my experience most change in a garden pond. In the wild this may be different, depending on the clarity of the water  It sometimes takes a few years for them to change, we had a white and red goldfish, it was like this for 2-3 years then in the space of a week went completely white |
Maybe it saw a ghost.
No seriously. I don't know about goldfish but I saw a documenry on tropical fish and in the striped fish their stripes actually move to the rear and new stipes form from the front end so it is possible that gold fish may change as they get older