I would leave them out, your pond id deep enough. You need a
power head or an air stone, you need to keep a hole in the ice. Remember to keep the PH or AS at the suface, so you don't disturb the warm water at the bottom of the pond. Aslo for redundancy throw a floating horse trough heater in your pond as a back-up. As long as your pond temp doesn't go below 34* F, your fish are safe.
Or if you want to bring them in for the winter, you will need a 100+ gallon stock tank with a filter and airstone/airpump.
HTH
