Dumb question...I have an inground pond in my yard. In it, during the summer, are 3 very happy goldfish. One is younger and smaller. One is about 6 years old and about 8 inches long. The third is a "fancy", about 6 inches. The pond is 16-18" deep. Traditionally, I keep them in a hex in my basement for the winter months. Cold weather approaching. Wondering how cold they can safetly stand it? I'd like to keep them outside as long as possible, as it's a much bigger environment and more natural for them.
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