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Cal-Mag: Iron or Sulfur

Hi everybody,
 
I wanted some folks to weigh in on Cal-Mag suppliments.  I recently picked up a bottle at the store (Aurora's "Roots Organics - CalMag") and it didn't contain Iron like most other brands, instead it had Sulfur.  It came highly recommended by the store owner (I told him I grow peppers), so I went with the one containing Sulfur.  Should I have got a bottle that had trace amounts of Iron? 
 
Looking at deficiency photos, Iron seems to come up every now and then.  I haven't opened it yet and can still exchange the bottle for something else.  Also, does anyone mix their own Calcium/Magnesium solution? 
 
Thanks
 
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