Just wanted to share the effect open windows has on our reef tanks. Over the past 7 days a PH measurement was taken and recorded every 10 minutes. This graph illustrates the daily swing from 8.10 to 8.18 for the first 3 days. Then I open the windows on the morning of Day 4 which causes the PH to rise over the following 4 days to 8.33
(https://ohioreef.com/proxy.php?request=http%3A%2F%2Fimg18.imageshack.us%2Fimg18%2F802%2Fphpng.png&hash=1eefcf3c7ba2768e87fafd88b80cc3459d577e24)