One thing is certain from this discussion. You can't take at face value anything anyone says about CO2 concentration in their tank without finding out how they derived it. This applies not only to fish stress, but also amount of CO2 for plant growth. It would be a big mistake for someone estimating his own CO2 by a method that understates the CO2 concentration following the suggestions of another who overestimates it. There would be a problem (but lesser in severity) the other way too.
I also think guaiac_boy deserves alot of credit for crystalizing this issue. At least he did for me.
Darrell Fennell |