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Hello! I am starting out my first backyard pond for my goldfish. Lots of them are small, but a few are a bit bigger. Not 8 in. big though. Right now they're in a doggy pool, maybe 100 gallons, which is too small. The main reason for getting a pond. So I have a big pond liner, a few pumps, some plants, rocks, all of the goodies. But my main question is how deep do I need to make the pond? I live in Chicago, and in the winter it can get very very cold. Right now, I'm about 2 feet deep in the ground, which is basically clay dirt. Any advice would be great. Thank you!