any idea what this is?

Nah, not really. Its a pretty even spread, this is the first day its been that high up on the canopy. Usually lower or middle fan leaves. Mostly bigger ones.
 
And I'm running 3 part advanced nutrients.
With big bud, and bud candy

Could also be too much PK hindering uptake of Ca or pH could be outside uptake range of Ca.

but definitely Ca def symptoms.

the cause could be a few different reasons.
 
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