This is my first winter and I'm not sure what to do? My pond is up on my deck about four feet off the ground it's 7L x 3W x 2D and I live in zone 8b and my water is currently 45 degrees F. I have 2 koi and 4 goldfish that I quit feeding a couple weeks ago. I cleaned my filters today, removed debris, took out the hyacinths, lettuce, lilly, and netted the pond. I'm running 2 pumps on each end of the pond with 2 small filters attached to the pumps. I guess my question is what to do next. Can I keep my pumps running all winter? Do I need to turn them off and get a heater and aerator? I want to do what ever it takes to keep my fish in the pond. I was also wondering if I can put the hyacinths back in the pond? Is there any benefit?