fresh air.....yes/no?

I see your probs im trying to fix it,help me out here try answering my questions and ill get back to ya.

Baldy.
baldyhippy Reviewed by baldyhippy on . If someone can be of some assistance I am in the 6th week and I am at a loss in this grow cycle. At the moment I have a 6 plant eco grower unit with a sylvania 600 watt grow hps bulb I have the homeboxXL and a digital ballast. About 3 days ago I noticed yellowing starting to occur. But before the yellowing had begun the plants were in great health. So far I have done everything in my knowledge to fix the problem. I had talked with various people and they had said overewatering but isn't that impossible with the system I am using? Rating: 5