Frankster said:

Looks like a bit of a cal/mag problem, or perhaps some other, mobile nute problem, if I'm not mistaken I'm not exactly sure, but it might be calcium deficient. Or possibly phosphorus. anyone?

(one of the professionals will know this question).

I would do something to verify your ph, and make sure it's not getting out of wack, and give it some micros (low dose). But verify your ph for sure... around 6-6.5 being optimal. I like about 6.2-6.5 range, personally.

When I started using azomite, (Micronized natural trace minerals) I've pretty much eliminated this kind of problem from occurring anymore.

Be sure to correct this problem before moving into flower, because it will get worse fast.

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