yo mord.
that's calcium def imho.. ive seen it with my PPP before. Add some cal-mag.. it'll help. Usually low PH in soil (like under 6.0) cases this, as well as using distilled or RO water without adding any calcium or epsom salts for mg.
here's a pic from http://www.ganjaguerrilla.net/
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The plowman is broad as the back of the land he is sowing
As he dances the circular track of the plow ever knowing
That the work of his day measures more than the planting and growing
Let it grow, let it grow, greatly yield
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