Is this light burn

Meaning if you are, you could be locking it out , either because of too much calcium, it's antagonistic to magnesium or too much magnesium, simply locking it out.
FF
 
Provided it has never touched the light light burn is not likely.

Any other leaves have this symptom?
At what stage is this? Only on top? Any mid or lower leaves?
Only at the top, about 2 or 3 weeks in flowering it's an auto runtz from barnies. Grown in happy frog. Started feeding big bloom about a week ago at half strength.
 
Only at the top, about 2 or 3 weeks in flowering it's an auto runtz from barnies. Grown in happy frog. Started feeding big bloom about a week ago at half strength.
What other Fox Farm products have you used on this grow?
Any other additives?

Are there other plants that have the same issues?
 
What other Fox Farm products have you used on this grow?
Any other additives?

Are there other plants that have the same issues?
No other plant has that issue. Using foxfarm happy frog and just started ff big bloom at half strength. I did defoliat way more than I should have a few days ago.
 
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