CO2 concentration and aquariums with lids
Recently I learned that an external canister filter can easily increase aquarium temperature by 2 degrees all by itself. My ambient temp was at 22.5 C and I noticed it climb to 24.5C a few days after WC. Apparently having a lid on in combination with the canister filter was enough.
So I made a test - what would happen if I left the lid open for 2 days? As you'd expect, tank temperature dropped to ambient 22.5C. However now I noticed that my CO2 concentration seems lower too, with the same exact BPS.
Can a lid (plastic one, with quite substantial seams and holes) keep CO2 in so well, that having it closed increases CO2 rate in the tank? CO2 is injected with an inline diffuser.
I noticed that my pH degassed was higher than I had measured earlier, and also when lights got on (so CO2 had been on for 1.5h without lights) my pH had not dropped nearly as much as it normally would. Now seems that CO2 is rising much slower than before.
120 liters, EI & CO2 and medium lights.
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