Welcome to the forum What you do with your pond, depends largely on your climate, your pond design and if you have fish. Can you give us a little more information?
Welcome, there are a few UK members here. Generally, we don't need to do much to our ponds. The climate is nowhere as severe as that experienced in some pars of the States and Canada.
I have goldfish, and I stop feeding once the temp drops below 10. You'll find the fish become less active as the temp drops. The main job at this time of year is to remove all dead vegetation, fallen leaves, etc.
Pond is too small for the koi. They grow to be 2' to 3'.
Until you make it deeper, I suggest putting a de-icer or tank heater. If you get a tank heater then make sure you get one that can stop working when the temp gets 4 or higher, or you can buy a small circuit check that shuts off electricity when temp gets to 4. All this is on amazon and is not expensive.
If you got leaves fall, net cover your pond before they all fall in. The leaves will consume oxygen and that's not good if the surface freezes in a tight area.
Putting an aerator is advisable to keep gas exchange going cause if the top freezes and the koi are in a tight area under the ice they will suffocate. Your big fish will die first...
I would make sure you attach this to a tank heater, otherwise if it is a deicer like you have in the picture then you wont need this thermo cube. The key is to keep a gas exchange opening in the ice to let all the ammonia out and the oxygen in.
I used this last year with the thermo cube and plan to use this this year.
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