I'm looking for some advice on the best way to heat a small 180 gallon pond in the winter. My current plan is to use 1-2 300 watt pond de-icers that float on the surface with a built in thermostat at about 45F. Im also planing on putting some form of insulation over the top of the pond to help keep the heat in. I live in the south of england so the winters aren't too heavy but still get below freezing. and my pond is a 180 gallon pre set pond. I'm keeping black moors and telescope goldfish in there at the moment and would it would be much better if i could keep them in all year round. Do you think this will work and be suitable for them. Many thanks, Aaron.