Hi all, I have two small ponds, one about 700 gallons and another about 125 gallons. They are both icing over consistently as of the last month or so. This is my first winter having ponds and first time dealing with them icing over. I have goldfish in the big pond and nothing in the small pond. I have been breaking the ice when I can but often I am not home consistently. I would like to find a way to keep the ice open in at least one area so gases can escape. My question is: should I go with a pond heater or a small aerator? I live in Western Washington and our temps on average get into the teens at the lowest point. Will an aerator work at these temps? I am open to hearing other options as well if they exist.