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Mates, with co2 we are looking for a 'sealed room' during lights on. That means ac is a must!!! We run between 1400-1800ppm for 12 hours straight, NO VENTING during lights on. We can run as high as 90 degrees during early veg and then start bringing it down to about 78 while at the same time reducing humidity toward the middle of the flowering period in order to encourage the plant to seal itself. The higher temps are required in order for the plant to metabolize at a higher rate, which it needs to do in order to use the co2 effectively. Feeding & watering have to be adjusted for the higher uptake of the plant. Basically I would not mess with co2 unless a near perfect environment can be provided. Otherwise we are just wasting our co2
Good luck mate!
Unity
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