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Discussion Starter · #1 ·
In a tank with no fish, can you have too much CO2?

I need to quickly grow out some aquatic plants for a biology lab at work and was wondering if there was an upper limit to how much pressurized CO2 you can introduce to a planted tank before it adversely impacts the plants (CO2 would be off at night, aeration on). I see 30ppm referenced, but if I exceed that is there an issue with the plants?

I know there is a max saturation level that's temperature dependent, a high potential to waste CO2 and pH issues. Without worrying about that yet, can too much CO2 kill plants in a tank if there is aeration during darkness?
 

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"possible"... yes.


Likely, Nope. It is a level that is very near impossible to reach.
this is correct it can happen but has to be with very controled curcumstances, for "land" plants i know there limit is near 1k ppm thus using flow meters vs bubble counters as its much more gas! i havent personally tried to get anywhere near those lvls in water cause there hasnt been any point to, if anything just go and seal the top of the tank to allow minimal gas exchange so you can get higher lvls while still using less co2
 

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Discussion Starter · #8 ·
Thanks for all the feedback.

I'm not necessarily wanting to "max out" the CO2, in particular, I just don't yet have the precision equipment to regulate CO2 levels the way I really need to! I'm working with a large CO2 tank that is about 5' high and don't have any needle valve or counter set up yet, so the control is very coarse. This is a temporary situation until I can get them to purchase a better set-up.
 
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