@pop22 Where did you read about these tests at 800ppm? My controller does not allow that anyway. I talked with an Atlas rep for a long time and read alot of their literature on co2 and cannabis. None had any info on autos specifically, but 1200-1500 is what I read. I use hydragaurd and my canopy will cover bucket in a week or or so, so i am not too worried. I have another 600w led I will bring into play prob next week.