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I was never a believer in the "closed house keeps pH down"... until now. Check out the pH trend from my system over the last week. The lower limit on pH in my system is typically 8.1 over night. One of my kids had 7 friends over last night and apparently, they breathe a lot! They dropped the pH in my system .25 lower than it normally goes! The pH starts dropping when they arrive and doesn't flatten out until they leave. I would have never believed that our resparate CO2 could make that kind of a difference in our tank pH. I'm plumbing an outdoor fresh air intake to my skimmer!
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