light burn would be pretty difficult with leds… plants will eat themselves if they aren’t fed enough… on the opposite end of the spectrum and probably more likely is that they’ve been fed too much and you have a nute lockout
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What’s your media? Do you have good aeration? May have dry pockets if your water is running right through!
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Could have a nutrient lockout due to incorrect Ph the lighter colored tops indicate to me it’s an immobile nutrient deficiency!
Edit: Per the comment with @toastyjakes it’s easy to go the other way as well by overfeeding one nutrient by causing a deficiency of another! A very fine balancing act when mixing up water solutions that’s why I’m an all organic guy sorry I can’t help much with that PPM’ stuff it’s like Chinese to me! Sorry
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Temps 78 day 67 night
Humidity 55-65
Feeding canna range at 1.3
Ph at 5.8
Run off came back at 1.1-1.2
Only watering coco when light bout 4kg for 11ltr pot
I give all nutes plenty of time to mix and let water warm to 65f
I use dechlorined water
Be sure to check also:
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Only use ro water in the humidifier
I love my babies n really want them praying happy
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N there under a 600w mh dimmed to 400w
Ends of the leaves look nutrient burned. Your ppm is far to high also. Flush the plants then feed them a lower dose of nutrients. They also look over watered and heat stressed. Back the lights off a little and feed less often. Cannabis love a dry environment but not too hot 65 - 75 degrees is ideal Water only one day then feed nutrients 2 days after. So water Monday miss Tuesday nutrients Wednesday miss Thursday water Friday miss Saturday nutrients Sunday and so on.
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In this community? Everyone is help and love 
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What kind of ventilation do you have the stomata on your leaves could be block due to poor air quality. Thats why your leave are saggin. . Just trying to look at this at all angles
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Also the slight discolor on the edges of some of the leaves looks like the start of overwatering like @MadScientist said. I’d stay LITFA for now
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Ya dont listen to us outdoor growers we dont know shit
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Houdini I have a 6ins outtake and a 5ins intake should exchange the air 3 times a min when on full power
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Well that seems about right . Well then I would definitely LITFA (leave it the fuck alone) and update us tomorrow
If it gets better it’s an overdose if it gets worse it’s a deficiency
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General rule of thumb is 2x the intake (passive) as out take. That means you should have around 56 sq. Inches intake. Not saying that is your issue, just a general comment.
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<img src="/uploads/default/original/3X/0/2/028bacd5927363f21fb48ff1e8584139b262c346.jpg" width="375" height="499">
What is the rule of thumb for 6in out and power intake?
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A little off topic but “rule of thumb” is a saying started back in the day when you could beat your wife as long as you used a stick no bigger than your thumb. More useless info from HOODINI
How about rule of green thumb instead I like that haha
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