Does a lid increase co2?

So i just got a cat and because of that i decided to put a lid on my planted tank to prevent the cat from hurting future inhabitants. One thing i just noticed yesturday was that my drop checker turned yellow. I didn't change anything except put a lid on my tank and ususally the drop checker is light green but now it's yellow. So my question is does having a lid keep more co2 in the tank? is their less gas exchange?

I use the co2 mist method for my pressurized system.

my poor little shrimpies....... That's what i thought but i wasn't 100% sure. I also wasn't sure if anyone else had this experience.

I guess if you do DIY co2 having a lid would help increase your co2 levels in the water.

sand crab said:

It could be the glass is stopping the light wave lengths that the plant was depending on .. It could be that plant was right on the edge and the top or change was too much for it ..

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Well i'm sure there is some diffraction from the lighting hitting the glass but i don't think that their would be enough diffraction to reduce the rate of photosynthesis to a noticeable level.

plantbrain said:

Does a lid reduce O2?

Yes.

Increase CO2?

Some, not a lot.

Regards,
Tom Barr

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So if a lid reduces O2 does that mean i need to try and increase my surface agitation just slightly? or should i just dial down my co2 a bit.

well the reason i ask was because the drop checker changed color to yellow and my SAE died. (He was the only fish in the tank). I know the SAE was healthy because he was in my qt tank for about 6 weeks and in my planted tank for about 4 weeks and then the day after i put the lid on the tank he dies. All the water parameters are normal and nothing else changed (supper low bioload). He also had algae wafers to supplement his diet (on top of the algae in the tank) so i don't think he died of starvation.