New growth yellow tips. What could it be?

  • Thread starter Brettdawg
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Growing in 60 pebbles 40% coco
4 weeks into veg
Ph always between 5.8 & 6.1
Ppm was 700.
Tap water 200ppm
Calmag 100ppm
A&b 400ppm
Using cana nutrients.
Feedin daily to run off
Temps today 25
Hunidty 59.
Gave dem a good flush and fed low ppm
Few pictures below one video.
So got yellow tips mainly on new growth and fan leaves. Got two lwaves thats gone one brown-rust mark on
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