Any idea what is causing this?

Im thinkin mag deffecient?
Due to the green veins in the leaf.
Give 1tbl spoon hydrated lime in a gal of water.
Should get ph in check an give her calcium an magniesium....

An its very safe...
 
Could use more info, soil or hydro, nutes, percentage of nutes fed, etc....?

Like scarhole said, looks like MG deficiency.

Epsom salt is magnesium sulfate and you can buy it at almost any dollar store, 1 tbsp/gal should do.

Give the plants a good flush to make sure there isn't build up if you're in soil.:leaf:
 
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