All this change in his colouration happened in less than 3-4 days.
In the begging i thought that the parameters wasn't fine so i made a big water change.
Not many things changed and after 1-2 days he lost his colour completely!
I have only one pic o him when the change started happening:
As you can see in the back near his fin there is the only place were you can see a little of his old colour.
I am preparing a bigger pond, with black liner, for some of my fish including him that i'm gonna be able to use until April.
Then we can see if the environment changes something.
Until then he can stay as he is, he is eating much always and besides his appearance everything else is great.
The only thing i can imagine is that ''something'' happened, something in the water, or some kind o poisoning and destroyed his colouration ability....can't say something else or explain it as i see a healthy fish, eating, swimming and growing...
Thanks for your opinions.
