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Winterizing a 300-Gallon Above-Ground Pond in Illinois

For a 300-gal poly tank in Central IL with 10–13 koi/goldfish:

Remove waterfall to prevent freeze damage.
Cover tightly with thick insulation.
Add a pond heater/de-icer.
Run an aerator/circulation pump.

Shallow above-ground ponds freeze fast. Heating + cover + aeration = best survival odds.

Pond and Water Gardening: Winterizing Live Sphagnum Moss and Bog Gardens in Cold Climates; Winterizing a Shallow Fishless Pond: Liner Protection & De-icing; Winterizing a Small Preformed Goldfish Pond in Missouri; Winter Pump Operation for 2,000-gal Pond in Virginia; Winterizing a Waterfall: To Run or Shut Down?; Winterizing Small Michigan Pond with Fish; Winterizing Large Pond: Fish Safety in Deep Water; Fertilizing Water Lilies for Better Growth in High-Nutrient Ponds; Winterizing a Small Atlanta Pond: Fountain Care and Future Fish Prep; Winterize Your Water Garden: Pond, Plants, and Fish Care

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