Boy, what a difference a 3 hour drive make! In the Ft. Lauderdale area, it dipped that cold during the night maybe in January/February 3-4 times a year, here in Orlando its this cold already in November! I am thinking about hanging some thick plastic sheets in the pool area to protect the small area where the ponds are....Its in a nice little corner, and if I can hang those sheets down from the ceiling to keep the cold out, that would help a lot! Airpumps are off, and the output from the filter is extended down to the ponds a bit more, so the water doesnt come into contact with the cold air all that much.
The only time I ever had to cover the ponds up with sheets of foam was when it dipped down to the 30s and 40s last winter......