Im thinking of building a pond im my backyard but i dont think the fish will make it through the winter. I am wondering if there will be a way to heat it. I read about a pond where the person used the hot water from the radiator which wouldnt be that hard but how would i regulate the temperature. any ideas. it gets fairly cold here usually 15degrees farenheit sometimes colder and we often get a few feet of snow but i think some type of pool cover in winter could take care of that