Oxygen and CO2 are necessary but so are many other things, nitrogen alkalinity ,calcium and a myriad of other major minor and trace elements. I wouldn't O2 and CO2 most critical but they are critical.
We see pH drop in winter in our closed up houses, but is this a result of houses being shut more tightly or is it an environmental response do to winter.
Why? How would the animals in the tank react to the season in a closed environment like a reef tank . For some the seasons would be different in their natural environments on given calendar day.
High relative humidity in a closed up house might play role via salt water mist which could rain in some CO2 in addition to high air levels adding to it via gas exchange, though.
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Tom
Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
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