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Why does my goldfish appear to have developed a black discolouration on it's tail fin?
Just the one goldfish..others previously with him got bullied & dyed. He has plenty of space, is fed well & cleaned regularly, plus seems healthy & has grown in size for the two years we've had him. Just noticed a black patch appearing on his top tail fin..any ideas..?
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- Anonymous8 years agoFavourite answer
It may be ammonia burn or maybe it's growing so he may change his colour. Some goldfish will change colours
Source(s): Experience
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