If your fish is turning white this may just be a natural change.
This can be due to water quality issues, lack of sunlight, or the feed being fed.
But it can also simply be due to the genetic heritage of that fish. Black ones can turn orange. Orange or red can turn white and white can change to orange. Its all a part of the natural process as the fish grows and matures.
Hope this helps you!
i i beleive the fish has a deseave,your answer does not cover that
Then you need to give a lot more information. Color changing is normal for this type of fish. You didn't even mention what color the fish is and what color its changing to.
Please give a more complete description.
is there a a product that i can purchase that would be an overall general all purpose tonicto keep my goldfish healthy.. my goldfish is orange colored
Best option is to make sure your water quality is good.
You can read about that here
I know you were concerned about diseases and this site goes over the common ones
Good water and good foods are the start for a healthy fish.
here's some info on feeding too