I have 2 goldfish, and had them for years, for about a year now, one of them has been turning silver and is now about half silver! Any explanations on why this is? I heard that it’s something to do with if you keep goldfish in the dark, they lose their colour but if so, how come the other goldfish isn’t turning silver?
Thanks.
age
What kind of goldfish? If it’s the black kind, it’s not uncomon for them to turn silver as they age.
Please return my Alchemy tool to me ASAP. I never should have told that bum that it worked in reverse on everything that wasn’t metal…
<sorry, couldn’t help it> 
-Butler
It’s inevitable, so you might as well not carp about it.
This colour changing sure smells fishy.
Obviously it was just electroplated, and not solid gold. Now the plating is wearing off.
Goldfish may change color with age simply due to genetics. Some sites also mention that lack of light could be a factor. And another consideration is food - perhaps the fish are not getting enough caroteniods in their food. (And different genetics could also mean that one fish might be more affected than the other by light or food problems.)
All that glisters is not gold
Often that we have been told. . . .
I would look to yabob’s jest for the answer.
We’ve got a ten-cent feeder going on four years old now, proving it’s who you know that counts. Anyway, at just about a year old, all of his orange coloring turned not silver, but black for about two months, than gradually turned back to orange. The white parts stayed white through out this process. Some kind of puberty-thing, perhaps?
DD
He’s decided to adopt a fiat standard?