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CO2 & science

A few recent postings about apparent CO2 *poisoning* brings to my mind the 
recent exchanges and very scientific explanations regarding CO2/oxygen 
content in water and whether or not it affects fish.

You can come up with numbers and scientific explanations to explain why CO2 
levels will not harm fish.

In practice however, it does happen. It's not helpful for people reading the 
list to see an impressive very technical explanation (must be true!) of why 
it is not harmful. It can be harmful. Depends on temperature, fish, and lots 
of other variables, but the bottom line is CO2 can kill fish.