Leaf twisting

Hey everyone, I'm having some issues eith my babies and I was looking for some experienced growers insight.

System: 4x4 w/ 15 plants under a 600w mh. Ph5.9, ~900-1000 ppm week 3 since planting the clones.

Background: had a ph problem in week one due to a bad meter. Healthy growth since then.

Problem: leaves are twisting and curling upwards. Some even rolling in on themselves.

Pictures to follow.

what's your room temp may be heat and light stress

900ppms in third week after week one was bad? Sounds like too much. I'd go with 500ppm and continue from there.

warble said:

900ppms in third week after week one was bad? Sounds like too much. I'd go with 500ppm and continue from there.

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i was thinking that also really high no burn yet showing in pics

Thanks for the responses everyone. Room temps have been as high as 83 during the day. Good old so cal winter.

Maybe I'll bite the bullet early and go for the AC unit.

Terry385 said:

i was thinking that also really high no burn yet showing in pics

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So far no nute burn or tip curling yet knock on wood. My water started at almost 300ppm so its not quite as high as it seems. Some of the older fan leaves still have signs of the ph issue but new growth has been looking solid.

I don't see nute burn at all. That problem doesn't look like its your nutrients. It could be a PH fluctuation that cause this, or a low relative humidity in the room. Other than that they look fine to me.