The koi pond is frothing a bit…

…and cold. But the temperature has not dropped due to turning on the pump. Which is good. We have a mixed bag of weather today…a few degrees colder air, but sun, which we didn't have yesterday; and when sun hits the black/dark liner, that tends to warm things up. Plus the pump contributes some heat. So…the forecast is to trend toward 60. The pond temp is about 45. Koi won't eat until about 52 ambient. I didn't want a general warming to throw the pond oxygen-poor, due to the nutrients in the w...