My goldfish change colors at least once a year. They change from gold to white to brown (in any order) & would like to know why. I've had them for many years & they have always been very healthy.

Goldfish change colors as they grow. See this section on my site. I don't know if anyone knows why.

http://www.fishpondinfo.com/gfish4.htm#health

my goldfish dont change that drastically but I've had a few brownish or silver goldfish lose that color and jsut be solid orange