They’re about 3 weeks old and I’m in coco perlite mix and I’ve only watered them twice total first time just water 2nd time with nutrients it’s been 4 days now and dont wanna water now cuz doesnt green mean overwatering only 4 of my plant soils like this the rest are fine and even look dryer
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Just some algae . They don’t eat much . Seriously though your good . Happens to all my grows. It grows just where the lights get to the coco . If it bothers you you can hit it with some peroxide and water
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And then you could use something to cover the coco from the light if you want to keep it away after the peroxide. But don’t hinder airflow, I would imagine.
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Thank u guys just wanted to make sure
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You’re under watering your coco. It’s meant to be watered at least once a day and it looks like you have an early calcium deficiency starting . Take a read through this article 
But I thought u just said It was normal cuz of the light
In the picture my leaves only look like that because I just did lst and they’re hitting side of pot
Yes the algae isn’t a concern . I was just offering up some resources that I’ve learned from in my travels. Coco for cannabis is a great site worth checking out
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