Hey I have some (fem) mazar, two weeks old and growing like crazy.
I want to 12-12 it now.. will this effect the potencey??

nope wil only affect yeild...peace

Yup. 2stoned is correct. Me, I would let it veg for a week or two more if these are your only plants, you will get a much higher yield.
peace,
-MyBUDdy

I agree.

Wait another 2 weeks.

You will be glad you did.

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Also, the longer you veg, the better the root system will be. I have overwatered/fertilized because I didn't have enough root mass to transport the nutes.

It all depends on how tall you want your finished plants. When I was doing SOG I needed them to be very short so I would veg 2 weeks and then flip. They others are correct if you have the room for tall plants let them veg if your short on hight flip now. I dont know about maz but my bigbud streches about 18 in in the first 2 weeks of flower

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I switched to 12-12 yesterday, as long as it will be as strong its kool.
They are fairly big and very healthy 18 days veg.
Will let you know.