Goldfish Xtra Cheddar Nutrition FactsThe hole must be bigger. Many pond pumps and filter techniques aren’t designed to work in cold temperatures. If your pond uses a filter or pump, check your system’s requirements in finding its lowest operating temperature, and turn it off when it gets too cold for the system to function correctly. If you let it run when the weather is too cold, it can freeze and ruin. If you have got a system that could run across winter, make certain it pulls water up as an alternative of moving water from the floor to the base. Deeper areas of the pond are likely to stay warmer than the floor, and your goldfish will congregate in the warmest areas.