Purple Branches/Slightly yellowing leaves

I'm doing a Vanilla Kush grow. Right now she is 3wks old. Over the past 12hrs or so shes been showing signs of possible potassium def. I posted some pics. Can anyone tell me if thats the case. :?::?::?::?:
 

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Looks like early stages of deficiency. Are you feeding yet.

Try fish emultion for a nice gentle additive that will give an easy organic dose of nitrogen and potassium.
 
She looks pretty healthy to me. But Jealous is right - its time for some nutes if you haven't started any yet. I prefer foxfarm, "big bloom" and "grow big" during vegetative growth. Lighting, heat and humidity decent?
 
Gave her a shot of BB last night. Woke up this morning and she was looking great. Heres a pic i just took. Also Kannabia special on left and bagseed on the right. All 3wks old. Thanks for your quik response guys....
 

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