CO2 is the last thing you need to worry about as long as you have fresh air exchange... It'll be a waste of time and money in your setup http://boards.cannabis.com/advanced-...ent-guide.html

Good to hear you found the problem. Keep us updated :jointsmile:
bigtopsfinn Reviewed by bigtopsfinn on . im a nexbie hi. i have 4 cuttings. i am using growells advise. when i got the cuttings a couple had white/yellow patches on them. as they are growing, which today is day 5 there are more yellow/white patches and dots on them. i am using a 600watt sodium light which i was told by almost evryone i asked that it was fine. i think i may have put the light to close to the cuttings. but now i have highed it. 150cm away from cuttings. i am using canna coco professional soil. the nutes i am using at the moment Rating: 5