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If you have a window in the attic get yourself a inline fan so it sucks freshair into your grow room,this fresh air will help with your plants yellowing problem youll also need to extract with another fan,you can put your lights on a timer if you want,personally i do it manually,just make sure you got a rely contactor for your 600 before plugging a timer in,try read as much as you can,get your enviroment sorted first and take it from there,good luck.
Baldy.
I went to the local hardware store and picked up a inline fan which does 500 cfm. I have a small duct which runs from my window to a exhaust tube which runs to the top of the grow room. I hope that the exchange of the air will help with the yellowing. I will keep everyone posted in the next couple days with pics and such to see if they perk back up and start to shoot again. Thank you for the help Baldy!!!
what is the ph????
No real answer so I'll just post: Most likely your ph is off or your ppms are either too high or too low or both. I'd start right there.
In addition to weedhound sounds to me like your not giving your plants enough food. Up the nutes man!
Peace