I have a pond that is around 3 1/2 feet deep. Right now, my thermometer
indicates that it is 0.1 degrees Celcius down there at the bottom. The Koi
and Goldfish
are still alive but isn't that a little too cold? It's not even winter yet.
I have a bubbler to keep the surface clear and a floating 1250 Watt heater
if I need it later, but I was thinking of lowering a low wattage heater to
the bottom of the pond just to make sure the poor fish don't freeze. Is this
a good idea?

BTW, my pond photos are at
http://pg.photos.yahoo.com/ph/murchi...mK9ICBHtrk1kvG

Scott