Thanks guys...Camera for x-mas... so we just gotta wait.
The co2....plants breathe co2...exhale oxygen. The more available co2 your plants can breathe, the quicker they grow. I've noticed a difference already...one, of those weaker Afghanis is perking up, although stunted compared.It's tap root two days ago was not barely poking through the net pot...I just checked a minute ago before posting, and today its like 5 inches into the res.....my second largest plants tap is about 10 inches floating in there like sphagetti! They're growin like, well...weeds! I've also switched to 20/4 on the lights and believe it helps...got the timer working.