leafs curling under thinning out. 3 weeks into flowering.

ermlight

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This is a photo strain. About 3 weeks into flowering grown in 3 gal smart pot. I'm only using the fox farm trio blossum builder at the moment. Is this a nute lock out? Or a p problem. Don't know the ph. But I use well water. Here's a picture of a leaf. Seems to only be on the larger leafs. They seem dry to the touch.
 

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Sometimes well water is not the correct ph.My well water comes in at almost 8 but i use organic nutes so i dont worry.You could try giving her some calcium ans see if that helps.With out knowing your ph thats all i can tell you at this time.
 
Thanks. All I have is ph test strips. I've tested water before and it was always in the mid 6s she's been fine the hole grow. I have yet to flush her though. could salt build up have something to do with it?
 
If your using synthetic nutes salt build up does happen.I would give her a good flush to clear out salt and excess nutes.When you restart nutes go light dose at first .Make sure your nutes contain phos and potassium.Also she might need some calcium.:D:
 
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