Goldfish in the pond over the winter
This will be my first year with goldfish, approx 45 2-6" in a 3500 gallon pond that is 3 1/2 feet deep. I will be leaving the pump on all winter(I did this last year with no fish). This keeps the pond from freezing over because of the waterfall. The filters will still be in place.
My question is do the goldfish need to eat anything during this time? Are they still active? What about ammonia buildup?