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Cotyledons yellowing befor true leaves show


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hi, guys so i got a problem with my plants or 1 any way

Only s couple of days old no true leaves yet but the cotyledons are turning yellow

Germinated in paper towel then into rockwool soaked in water with ph of 5.5, grown under led with true wattage of 160,

Any help is majority appreciated

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picture would help heaps in the diagnosis 

but my thoughts are:

rock wool too wet (rock wool needs to dry out a bit between waterings)

ph too low (in a perfect world about 6-6.5 is what you want)

NewGrowerSyndrom - i.e. too much love (back away from your seedling for a day or 3)

lights could be too close too but I am not a led grower

 

Luck!

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Cheers frazz, ye iv tried to flush them as best as I could just as best and safe as I could, they seem to be looking abit better, they broke seed on the 13th leaves are still really really tiny with no sign of any thing else, but there not dropping or anything like that
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