https://groupextradiscount.com/story/50489/ Algae Bloom Causes Carbon Dioxide Levels To Rise At Night time Carbon Dioxide (CO2) And Oxygen (O2) operate hand in hand in a backyard garden pond. As oxygen stages in the pond h2o improve, the stage of carbon dioxide decreases and vice versa. This is a natural approach. Oxygen levels are at their least expensive at dawn, owing to the processes using spot in your pond more than night time. Tue, 29 Nov 2016 06:45:05 EST en