Can someone tell me why my leaves are curling on some plants
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Good morning @organicgrower4m, plants are growing in coco, I use Advanced Nutrients for Veg, lights are double ended at 7.5 feet, bulbs are from Oval, PH is always around 6.0, only some plants curl and the leaves become almost brittle, temp is 23 degrees,
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Is this going on the top?
Many times it pays to check your run off numbers too so you have a better idea of what the pH is in the soil instead of just the water going inn the top.
Also what is your fertilizer concentration? Do you have a way of measuring EC or TDS because it looks to me like they could potentially be getting too much of something.
When I’m in doubt and at a total loss as to what’s wrong in veg, I turn everything down a notch. I lower my fertilizer concentrations, turn down my lighting intensity a little (or raise the light itself), then make sure my pH and climate is spot on for the next several days or so then reevaluate.
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@Bogleg @BG_SAGE @macgyver_stoner here are some better pictures, I have sprayed for Thrips, and tomorrow I will flush the plants, but I am still confused on what is causing this problem, my day temp is 23 degrees, lights are at 8 feet, set at 720 watts, and I am four weeks in veg, only half the plants have this problem, the rest are perfect
thanks for your help
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Welcome to Growers Network @neuroticjew 
I see one of our Growers typing now 
Let me tag a couple others also
@macgyver_stoner @myfriendis410 @tdubwilly
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Good Morning @neuroticjew, it’s going to help everyone that stops in here to help if they knew a little back round.
Like,
Media ?
Age?
What’s you feeding them ? When you fed last?
Light height and tensity ?
Watering PH level ?
Any neglect before this issue ?
And can you get a better pic with out the yellow light ?
Let’s start there.
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Are they Autos?
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Not auto flowers
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Your coco, is it pre washed and conditioned?
Is this their version for coco?
And welcome to the GN @neuroticjew!
happy growing,
MacG
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Coco is pre washed and conditioned
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@neuroticjew, are you using the Advanced Nutrients formula that is specifically for coco?
At what concentration are you feeding to your plants? EC/TDS/PPM?
Do you know the pH in the media? At the roots?
Have you been practicing any procedures to be sure you are not getting a nutrient salt toxic build up in your media?
Have you noticed any bugs? Are you checking the undersides of the leaves? Do you have sticky traps, as both a preventative measure, but it is also a great help in identifying the critters that might be infesting your crop.
Happy growing,
MacG
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@macgyver_stoner I am only able to check PPM and PH, my PPM going in is 980, and my run off over 2000, my PH is 6.0 going in, and 5.8 run off, the plants are still young and have only had the first watering since the transplant, I check for bugs, and I just sprayed for Thrips as a preventive
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Looks like bugs to me
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Could be spider mites are there any webs at all?
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SM All day. Prob won’t web in veg unless it’s REALLY bad. Time to study up on some IPM (Integrated Pest Management).
#heyatleastitsnotrussets
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no spider mites, for sure not! I did spray for Thrips today, just in case
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Please get a close up picture of the underside of one of the leaves - ideally one that is patchy but not dry yet… kind of looks like thrips too.
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I don’t think thrips, I am a thrip specialist I’m told lol.but really, that’s a super big issue around Nova Scotia .you would see pale shiny miner strips.mites look kinda fungal (damage)
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Agreed, but the damage is too extensive, and the pictures not high enough resolution, to get a good read for me… hence the ask for some more pics. 
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I will post better pictures next week
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