I have a 2500 gal koi pond in zone 7 also and I cover it with a frame ( PVC ) and clear reinforced poly ( woven ). for the winter . I run 2 aerators 12" deep all winter and turn my pump off. The poly acts as a hot house even when it is cold and my water hardly ever freezes . If I know the temps are going to get real low for a few days I run a heater to keep a hole in the ice. Has worked great for 9 years.welcome and do like I do with my lily pond .I used heavy plastic over it like a hoop house .Colleen does it in Canada
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