I'm gonna start pumping pressurized co2 into my terrarium! I'm gonna see if it makes them grow at an accelerated rate. I plan on using approximately 2/3rds of an ounce of co2 per day. (that means i'll go through 20 oz. per month, but co2 is cheap!) The co2 ppm of your average air is about 3 ppm (and probably less in terraria!) and I'm going to increase it to at least 10 times that amount. I'm going to use a "drop checker" with come pure water with a KH of 4 and some bromethyl blue to tell me the ppm of the co2 in the air.
Ok, how should I go about taking pics? What intervals should I take pics and any ideas on how to improve my experiment? I was going to leave my terrarium open-topped since the co2 will sink the the bottom where the plants are anyway. OR should I leave the terrarium closed without circulation (since it wouldn't be totally sealed)? I can't see a problem with leaving it open as long as there is no ceiling fan on.
I'm pretty excited about this and I bet Bugweed will be interested lol
One more question. Should the experiment take place in my 75 gallon GH style terrarium with a 250 watt MH, or in a 10 gallon planted aquarium with a 65 watt PC?