Any limit to CO2 in a fish-free tank?

[sns26]

I've rescaped my main tank, and that included adding enough new Aquasoil that I moved the fish to temporary quarters to let the ammonia settle down. While the critters are off premises and I'm trying to get the plants started off right, I jacked up the CO2 so that my drop checker is a nice pale yellow. Which got me thinking...aside from major pH drop, is there any reason NOT to pump the CO2 up super-duper high for a few weeks?

[krisw]

You can crank higher than you would with fish, but there's always a limit for anything we add to our tanks. Would be interesting to know what the tolerances of the various bacterial colonies are.

[JLW]

I'm curious... CO2 will certainly reach a saturation point where more won't do anything. Of course, this will be higher than just the CO2 saturation of water; you'll have Saturation + Photosynthesis. I wonder if high CO2 overnight could suffocate the plants? They can't photosynthesize and get rid of excess CO2 without light.

[sukrol]

I wonder if high CO2 overnight could suffocate the plants? They can't photosynthesize and get rid of excess CO2 without light.

Well you'd hope the CO2 is on a timer and the tank has good water surface agitation, etc...