Mr.Juice said:

The light is way too strong for a little baby plant. It’s cooking your plant (taco curling) and drying out the top of the soil. With how much you’re watering it’s most likely too wet at the bottom too (downward curling) Get rid of that light for now, you are just wasting wattage even if you do move it up, put some fluorescent on it for now, or something less intense. And don’t be giving any nutrients of you are.
Do you have holes in the bottom of that solo cup?
To give an idea, I would only give about 100mL of water every 4-5 days.
You didn’t mention what you were growing in, it may be too fine and not letting enough oxygen get to the roots.

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One drop said:

Taco Tuesday .

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Aqua Man said:

Are you misting the soil to water it?

I agree with everyone... To much light.

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Mrplants420 said:

Here I have my 3 week old cannabis seedling . I am using organic soil with a 2000 watt (390 real watts) king LED about 26 inches away from the top of my baby.
I noticed the leaves curling down and some yellow on the bottom ones . Also a bit of purple just started to come in on the stems . I am most worried about the curdling down on leaves and yellow on them. Can someone with experience pin point the problem ?i always check to make sure my soil isn’t all the way dry.My soil after about half day of being watered always dries up really fast so I feel the need to spray with water twice a day but am trying to not over water and also trying not to let my plant dry out as the soil always looks really dry after like 4-5 of being under the light and breeze of fan.What’s going on

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Mrplants420 said:

Everyone check out my new thread and help please

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Aqua Man said:

Can you link it?

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Mrplants420 said:

Not at all

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