Luke, I started fasting at Christmas because we had a cool spell. Now, as you know, we are having a warmer than normal period. It has near 80F the last few days. The pond was at 68F at 7pm today. But, a cold front is on the way. It will be in the 30s over the weekend. We'll see how dramatic a shift the pond temp does.
JR, I'm reading everything you say on this subject very carefully. I'm convinced about the importance of the seasonal approach. Short of getting a chiller, I'm going to do what I can.
Jungle, I love the variety of your garden. Some I recognize only from pictures I've seen, others I've seen in South Florida gardens. The yellow walking iris (what I call it) grows in my yard, but not the season for it to bloom here. (Dramatic photo for such a subdued beauty!) But in the most recent set of pics is something I am uncertain about. Next to the yellow iris is what looks like a Heliconia, but the leaves are all wrong. Is the foliage just background? ...Exotic stuff. A lot of beautiful tropicals. Wish they could all be grown here, but I think there are a few that might not care for even a light frost.

So, how low do your pond temps get?