Wow, I dream yet of temps in the 70's! I have been waffling back and forth since yesterday about do I or don't I get waterfall and fountain started back up. I think I'm going to go for it. I figure if I put it on a timer and only run it during the day, the water circulating on the waterfall and fountain will actually warm the pond since the air temps are going to be in 40's and 50 this week. If I don't run it at night, it won't chill it again at night as quick. Does it work that way, or am I wrong in thinking that way? I know others only run their water during the day, but once the temps are stabilized, I will run my 24/7, just wondering about now with the colder temps.