What do you do with your Goldfish in the Winter?

As you can see, I brought mine inside. These are in a 50 gallon water garden pond that is indoors. When spring comes and the weather is warmer I will transfer them to an outdoor 250 gallon pond with water lilleys and a rock shelter to avoid the Blue Heron that drops by on occasion. Frogs love it too, they join right in. This year, I plan on expanding the flower bed, add a wide boarder of crush rock to support the track that will go around it and connect back to the house. . . . plus a siding. . . ..and maybe a station. . . .