It's turned super cold here in Iowa. I've always wondered exactly what happens under the ice in my pond. This article is a great source of information the Winter effect on koi, goldfish and ponds. Written by Richard Carlson and published by AKCA answers some of the most basic pond questions such as: how to prepare the pond, immune system changes, toxic gases, ammonia and aeromonas bacteria problems. Simple tips on feeding and preparing your filters can make a world of difference to your fish. Visit Http://www.richdeer3pondsupplies.com/site/1566246/page/902636 !Http://www.richdeer3pondsupplies.com/site/1566246/page/902636to view the entire article. Stay warm and wish for Spring