He/she is probably just developing mature coloring. Many goldfish will be
widely varied in their coloring as juveniles, but as they grow up they will
become completely orange. I bought 4 feeders of all different colors and
patterns. Every one of them is solid orange now.



"Gfishery" wrote in message
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"Angrie.Woman" wrote in message
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"mort" wrote in message
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Yup. Black edges to the fins is the sign of too much ammonia in the
tank
water. Immediate remedy is do a large water change to get rid of the
ammonia.... 'til you cycle your filter properly.

I think that the OP might want to actually *check* the ammonia levels. My
NewFish has some black on his fins, and my ammonia is at 0. I think it's
just his coloring.

My wife picked our 2nd orange fantail from the LFS tank because of the
unique black lining on the edge of its tail.
At least, we thought it was unique.....
3 weeks in our tank and the black color is slowly disappearing (tail
becoming fully orange).

Am I to understand that the LFS sold me an orange fantail that had
suffered ammonia damage, and is recovering in my tank?