What causes this leaf curling??

This is the only plant in my room doing this, the strain is Darkstar. I'm guessing the problem is strain specific, and nutrient related. Could this be lockout from too high of a pH. I know it is around 6.7 instead of 6.2. It is only on a few of the middle fan leaves, also. The bottom, and the top fan leaves aren't doing this. Thanks for any help. Second pic is a leaf on the exact same plant, only one node down.

whats your rH and temps?

Humidity? Pests? Did you check your leaves for pests such as mites, etc?

That is some crazy stretching there.

looks like heat stress although ive seen overwatering give me cupping as well.

yall say it might be the

• Humidity what should his humidity be mine is only 20 % is that low they are only seedling also if it is how do i raise it?​
  
  
  
  

yep 20% is low you want it about 40%

skefaman said:

yep 20% is low you want it about 40%

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how would i raise it with out a humitifyer just leave alot of bowls with water in the room?

that would work to an extent.. really its best to get humidifier to raise it.. you can find pretty cheap ones... maybe a swamp cooler if you have temp trouble also.

well i got a plug in heater that has a way to set the temps its 70 in my room but 80-5 under the lights for the plants i have a big box fan that runs on low every 15 mins off and on i have one bucket thats filled with water in the room its a 5x5x 20 feets im planning on spilliting my room into 2 one flower one vegs and clones but for right now im heating the whole room its like i said 70 temp for the hole room i have the gage at the top and i have one on the plants which say 80-85 i spray they plants 2 times a day to try to raise the humidity but i guess its not enough lol

damn they are cheap i found one for 6$ on craigslist would this work Sunbeam 3.5 gal cool mist Humidifier

yep exactly

lol i just asked my buddy that use to grow hes got 3 of them the 2 tank ones im picking it up today so is it bad to have high humidity liike whats the highest you want it?
he said he kept his around 80 % but i like to heard facts from everyone else so i dont fuck my shit up lol

80 is kinda high, for veg it would be fine but for flower u want it 35-50 imo

so it would be best if i had 2 one for each room? i wish you could just set what % you wanted it to go to then it would turn off like my heater lol ill just have to keep a eye on it

with a little experimenting and a timer im sure you can get it to do what you need

good idea i never thought about the timer and i got like 6 of them lol kept getting them from all my friends that stopped lol thanks for all the pointers man

50% would work for both if you can set it up near intakes of both rooms(not exactly sure how your set up is)

well i dont have intake or outtake yet my room is under a the floor in a room and the top isnt sealed so the air moved thro out the room with 2 fans no problin yet ive been pricing some fans and a coal filter its i just dont need it yet no smell and plus my whole block smells like weed lol not my house

im just waiting on finding some cheap ones used that how i found 3 600 watt hps for only 300 for all 3 with 3 lights extra