I live in Zone 8 and have a small pond with three goldfish. There is a circulating waterfall but the pump will need to be removed. The measurements are approximately 6' x 5' and 18" to 2' deep in the deepest part. We don't want our fish to die and wondered what kind of de-icer we could use to prevent this. Also, what kind of aerator as this is a small pond. Janice

Check out your other post. I answered there.