08-05-2012, 06:10 AM
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Goldfish and Koi are coldwater fish. Also, the higher the water temperature the less oxygen is in the water for the fish to use. In addition, the larger the tank the longer many changes take, including water temperature.
You should look up goldfish in the Tropical Fish Profiles, on the left side of the menu under the Tropical Fish Keeping graphic or cllick on the highlighted word in this post.