is this recently exposed to sunlight and before was indoors?
that could be anything.. need ot know what hte pH is, what you've done lately etc etc... outdoor growers have a bit more of an excuse, but even they cause nearly all their own problems. we provide for the plant, so if it has a problem it is something we are doing, not magic.
if feeding constantly, back off... it might be that your feed is just incomplete. i see a ton of biobizz grows with problems, lol.