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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 |
I was gutted when the beautiful red and black goldfish I bought went entirely red
Lesson learnt - yes they do change colour!