Hi all,
I have a gold fish thats been with me for the past 2yrs, and its going strong

However recently ,about a month ago it started to loose its color....
Its now turned into part white and part gold......
I have not seen any change in its behavior,it still eats well and moves around as it was doing all the while!!!Its grown a lot bigger too!!!
What could be the issues?
I change the water every 15days....
I also have 2 more goldfishes along with a couple of tetras ,silver dollor,guppies...
The other 2 gold fishes are grown tremendously but they have not turned partly white?
Wanted to know how i can get back the color?