Wow-the affects of house guests and pH

[PoonTang]

I had a dozen people or so over for the afternoon and supper and my pH alarm on my Apex started going off. I figured no biggie, just a bad reading or something, but it kept slowly going lower and lower. Finally It dawned on me that it was all the people in the same room as the tank and the build up of CO2. This is the first time I have had a large group over while having the advantage of continuous online monitoring. The drop was quite dramatic, .2 in just a couple of hours, but I was able to change the direction by opening the door. I never had any idea that the change would be quite that drastic.