im gonna agree with this imo it is MAG .. get u some calMag or use some dolomite lime or epsom salt.There are no pics of nute lockout, because there's so many different nutes, that can be locked out. What you need to do, is look at pics of deficiences, and determine which nute is lacking. Then, you go from there, and determine whether it's simply underfed, or the nute is indeed, locked out. To me, it looks like a magnesium deficiency starting.