The soil seems to be a bit moist an inch or so down, not wet by any means but slightly moist. There are holes in the bottom, when I water I always put water in until a little comes out, it usually takes about 1.5-2 cups.

I don't think it's probably CO2, it's in a pretty well-ventilated area.

I just transplanted into this pot 12 days ago and I've seen a lot of pictures of much larger plants in this size or smaller pots that seemed to be doing fine. I'll certainly check though, is there an easy way see if the roots are covering the outside of the pot without hurting the plant (i.e. pulling it out of the pot)?

Thanks for the help