With what could be the last days of January that are above freezing there are a few chores you should consider taking care of in the pond before it freezes again.
1. Remove as much organic debris from the pond as possible. Use a net to remove leaves. Cut back any plants that may still be in the pond. If this debris is left in the pond it will decompose. The decomposition process will give off gases that are toxic to the fish.
2. If you are keeping the pump running for the winter remove any filter media that may slow the water enough to allow it to freeze. If you are not going to keep the pump running now would be a good time to remove it.
3. If the pump is coming out make sure you install a heater or an aerator to keep a hole in the ice during the winter months.
If your pond is deeper than 18" there is very little chance it will freeze solid in our climate. Keeping the pump running will ensure that the pond only freezes on the surface.
Limiting the organic debris left to decay in the pond over winter and utilizing a method to keep a hole in the ice so any gases can escape will give your fish the best chance of surviving the winter.
PLEASE do not hit the ice with a hammer should your pond freeze over, it will cause a concussive force that may kill your fish.
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