08-11-2010, 08:59 PM
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Goldfish may also reach deeper and richer colors in a pond than in a tank because in a pond, the water is very natural, they are in a healthier, again more natural environment, they are constantly feeding on little things living in the water and bugs that fall in which gives them lots of nutrients. In a tank, the fish won't get all of those things.
I had an experience like this recently. I had my guppies and cories in my pond for the summer. When I put them in, they were very regular not very colourful, but today, when I pulled them out and brought them back to the aquarium, they were much bigger, healthier I presume and their colours were vibrant and beautiful.