Seriously - Discussion On Spraying CO2, Any Point?

[faithlessxxx]

Is the CO2 from the bottle coming in from the top of the area? Do you stop your fans off and on throughout the light period? I guess even with the little DIY's there is a bit of work to get some bennifet.
Adieu

I have a thin pvc tube like a straw inserted and insulated near the top of the bottle, that stretches out a little bit above the plants. There are a couple of small 3mm punctures along the way above the plants.

Stop fans: Yupp.