that's a handy chart...thanks for posting it.

but in general, if using fresh, quality potting soil there shouldn't be any mineral definciencies. many strains get purple veins as they mature (i have several hawaiians doing it now) and also many of the afghani derivatives will show a blue-purple-ish tint all over (like the bb strains).

from what i see of your plant it looks as though some heavy trimming has been done on it and it's looking for more light (all the smaller leaves, no fans and the long spacing between nodes). don't trim it anymore (if ya are) and try to get it more light during the on period...as far as minerals, anything you add now won't have enough time to effect anything anyway so i'd forget about it. wait for this to be picked but start planning your next grow now...