This is my first winter with my pond and I'm shooting from the hip basically.
I turned off my pumps and drained my Bio Filter unit. My air stones are still pumping air (about 18 inches from the bottom of the pond). But the pond continues to freeze over.
I got a pond heater that thawed the ice (it was almost 8 inches thick!) and then my Comets started coming up to the surface. The water temp got up to 45 degrees! So I turned off the heater. It stayed ice-free for about a week. This morning it was frozen over again (about an inch thick). We had 0 degree temps last night.
I also am not digging on how brown the water looks without filtration. I'm kind of dreading the spring clean up that is going to occur.
On a brighter note, when the pond thawed, no fish floated to the surface, so I'm hoping all are still alive and hiding at the bottom.
Stats:
1500 gal pond
4 feet deep at the deepest point
4 Koi (6 inch), 7 Comets (4 inch)
55gal bio filter, two 3500 gph pumps, UV and bog (5X7X18inches) and a 20 inch drop waterfall.