New growth leads twisting

So all my strains are barneys farm- pineapple chunk, runtz muffin, gorilla skittelz, purple punch, wedding cake..I’m growing in soil in fabric pots using plant magic nutes, under high power quantum board LEDS. I’ve recently flipped to flower and added my co2 to the sealed room, they look healthy and are growing, but the new growth leaves are starting to twist ? At first it was one strain but all of them now are doing it apart from the purple punch. Anyone got any ideas? I PH between 6.3 and 6.8 every feed, I’m pretty sure it’s not the PH as I got it wrong on one feed before and it burnt the leaves and discoloured them. I’ve moved my lights further away that hasn’t helped. I have a LUX a meter anyway so that shouldn’t be an issue. Not sure what else it could be! Is it a problem from anyone’s experience ?

Also my temps are between 29 and 31 and Rh 40-60

To me it looks like heat/light stress.
Cannabis prefers a temp around 26-28C and any higher than 28C can actually stop growth, I’d lower the temp and see how they respond

Green_Alchemist said:

To me it looks like heat/light stress.
Cannabis prefers a temp around 26-28C and any higher than 28C can actually stop growth, I’d lower the temp and see how they respond

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Ok bro thanks. I’ve got co2 at 1300 ppm in there though shouldn’t temp be higher with co2?

jack06041989 said:

Ok bro thanks. I’ve got co2 at 1300 ppm in there though shouldn’t temp be higher with co2?

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Yeah, that looks like heat/light stress. If you add co2 you can (and should) run higher temps. Did you add CO2 and bump up the temperatures suddenly or did you do it gradually. I'd back the lights off and drop temps a little and then slowly increase both over time.

sf_frankie said:

Yeah, that looks like heat/light stress. If you add co2 you can (and should) run higher temps. Did you add CO2 and bump up the temperatures suddenly or did you do it gradually. I'd back the lights off and drop temps a little and then slowly increase both over time.

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I added the co2 when I flipped and i did bump the temps straight away to be fair.. I went from 28 to 31 with a 2 degree swing either way. I’ve dropped down to 28 now hopefully that sorts them, thanks for the help.

jack06041989 said:

I added the co2 when I flipped and i did bump the temps straight away to be fair.. I went from 28 to 31 with a 2 degree swing either way. I’ve dropped down to 28 now hopefully that sorts them, thanks for the help.

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Did you increase the light intensity at the same time too? Sudden/rapid changes are no bueno! I made the same mistake when I added CO2 the first time. I dropped temps back to where they were before and then added 2F per day. Think I ended up finishing around 87F but you can go up to the low 90s apparently. I don't have first hand experience running that hot though.

sf_frankie said:

Did you increase the light intensity at the same time too? Sudden/rapid changes are no bueno! I made the same mistake when I added CO2 the first time. I dropped temps back to where they were before and then added 2F per day. Think I ended up finishing around 87F but you can go up to the low 90s apparently. I don't have first hand experience running that hot though.

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I didn’t increase the light no, I increased it slowly through late veg into flower. Gotta be the heat thing. This is my first time with co2 as well still learning lol!

jack06041989 said:

I didn’t increase the light no, I increased it slowly through late veg into flower. Gotta be the heat thing. This is my first time with co2 as well still learning lol!

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I'm still learning too but I think I've got it pretty well dialed in! Its hard because there aren't as many folks running CO2 so some of the instructions out there don't exactly apply to us. Let me know if you have any other questions and I can try and help.

Cheers bro, what temp do you eventually crank it up to in there ? Have you noticed great results with co2 compared to without ?

jack06041989 said:

Cheers bro, what temp do you eventually crank it up to in there ? Have you noticed great results with co2 compared to without ?

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I finished at 87F IIRC. This run, I might experiment with lower temps to try and coax out the purple bud coloring. I haven't decided yet. I've never grown without it so I can't compare personal results. I pulled 4.25lbs from 2 720w LED lights last run. No way I cross 2lbs/light with out CO2 though. I made a lot of rookie mistakes and still ended up with a decent yield of some pretty high quality buds. The plants were nearly dead twice before I flowered and I still ended up with a good result and I think CO2 had a large hand in that.