CO2 is not that much a problem: add extra aeration and it's done with. Or
plants will use it during the day (but make it during the night) - so air
stones or venturies or water falls or ANYthing that will increase
oxygenation is OK and will off gas the CO2. The gas you need to be worried
about is *hydrogen sulfide*: this will KILL your fish. - it's the stuff that
smells like rotten eggs when you disturb pockets of it, like when you clean
the pond. What's the save level for that? ZERO

Lee


"JGW" wrote in message
...
Does anybody have a sense of what an acceptable range for pond water
C02 levels is? I checked all the pond water chemistry web pages I
could find and couldn't find any guidelines.

Thanks.

Joan
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