Quote Originally Posted by stinkyattic
Slight tip burn along with N def looks like lockout from fert buildup in soil and/or overwatering.
Your exhaust should be brinigng fresh, not recirculated, air into the room- if I mis-read, cool; if not, rearrange the ducting to allow a constant supply of fresh, cool air.
How lo9ng have the plants been in those pots?
Do the pots have a built in drain cup? If yes, remove it and smell around for evidence of rot- those things make drainage TERRIBLE in any pot and cannabis hates poorly draining soil.

You didn't mis-read the exhaust/intake, as there is none. lol. Thanks a lot for taking the time to help me

I just talked to a guy about buying his 8in can fan with 8in ducting and ph/ec/ppm pen. He also had a 40in filter he wants $200 for lol. Think i'll be making my own.

I can't figure out how to get fresh air in there, the outside air is way too cold for an intake source so i'm left with two options. intake fresh air from the house to the room through the door by laying ducting outside the grow room and having the 8in can fan blow into the room. Or, cut a hole in the wall, and have the can fan exhaust into the next room allowing fresh air to passively come in through the open door. I'd rather do option number 2 as i can put a charcoal filter into the next room connected to the fan pushing air through it.

The plants have been in the pots for 3wks and the pots are 2.3gallons I'm about to put them in 5gal buckets. Theres no draining dish. I know better than that