I stop feeding my pond fish at the end of Oct, also hoover all around the bottom of the pond trying to not upset the fish, I clean out the pump fountain of any build up of gunk. I clean my underwater lights (so I can check the fish) of any algae and check all the connections. Top up the pond water with pre treated water from my water storage butt, check for any dead or rotting plant foliage and remove them. Then place my netting back over the pond, then it’s time to check out my filtration and uv bulb chamber.