I've been injecting co2 into my planted tank, and it works wonders! I'm talking a half inch of growth per day when I first started, now 3 inches per week.
I figured, what the hell, and mixed up a half gallon of DIY co2 mixture. I put it in the terrarium, and what do I find 3 days later when I return? My pings have colored up, my dews are LADEN with dew like they are in full sun, and my plants look bigger and the utrics look fuller! All other conditions have stayed exactly the same, minus the 24/7 co2 injection.
It might be something to think about, guys. I know I'm not imagining the boost in growth.