I don't know much about it, but from what I've seen, as long as you have moving water, only the surface of the water may freeze and the fish should survive the winter. Koi and goldfish are cold water fish, so they should be fine.
I think The Ark on the NE has or used to have Koi and pond info. Might want to try there.
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Current Tank Info: 75 Gallon Mixed Reef
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