What is this on my seedling?

Redhemption

Member
Hey guys,
This happened from night to day. It is now full of brown spots. Can anyone help me identify the problem?
 

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The plant is 3 weeks old... No nutrients used so far, only CalMag and the environment is at 70% RH plus 25ºC. I have a total of 1000w and they,re close to the plant as the makers specs tells. The ph is at 6.2ish always but I sure float a bit.
 
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