it is relative, meaning that higher O2 levels will allow fish to tolerate more CO2
but that is the opposite of what the previous posters just wrote
And essentially what my initial question was asking...
CO2 inhibits the uptake of O2 through the gills because hemoglobin prefers CO2 to O2, but.... if you increase the O2 concentration, will the greater difference in conc. between the water and the fish's blood help with binding of oxygen thus increasing the lethal concentration of CO2?
I currently don't have any fish in the tank as I wanted to run some tests on the rates of plant growth. When I did have fishies, my DC was more on the yellow side with the 4dkh solution. I would start it about an hour before lights on and it would be at my chosen conc about an hour into my photoperiod. I agree about the usefullness of the DC's and it is really just an estimate with a lot of variables.
I was AND still am diffusing it through a cerges style reactor, so I do not have CO2 bubbles in my tank. I have read that misting is more efficient for co2 uptake in plants therefore you would not need as high of a co2 conc...is this correct?
With the fish gone, i have been blasting CO2, and the DC is basically pee yellow 24/7 and I gotta say I am getting wonderful growth
Clearly fish would not last very long in this scenario so i was wondering if increasing the Oxygen would allow me to theoretically run higher CO2 concentrations without gassing any fish.