Bruce the colder the water the fish are in,, the less solids they will produce due to eating less food thus water changes would not have to be as frequent nor as much. As mentioned earlier I would try to have the water mostly above 50F-55F which will keep the biofilter active and the fish will feed a little better and that may result in a little fish growth or at least they will maintain good body condition over the winter.

Last edited by Bill Cody; 11/05/12 09:44 AM.

aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management