xanado18answered grow question 5 years ago when i started my grow i noticed warping leaves, came to find out the ph of the medium was much much higher than that of the res (i had to ph the resevoir to 5.0 and it would still climb to 6.5 if theres any way for you to ceck the ph at the actual rootzone or runoff id look into that.
from what others have told me, its rarely a deficiency so much as a PH issue. good luck, hope that helps!