... Roy-- this is a fairly uncommon mutation, some call it "cloven hoof" leaf,... it's a hallmark in some strains, and not a liability to the plant at all,... Yeah, the spots are Ca defc. only, no sign of Mg defc. symptoms fortunately,... they do often occur together, for various physiological reasons...it's no coincidence that the two are so often paired together in supplements! Make sure your pH is in desired range,...you want to be sure this is just a lack-of defc., not one caused by pH lockout,.... use full strength on that supp'!