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PMDD color and Calcium

"Strange Colors"

I use the Chelated trace mix from Home Grown Hydro in my PMDD mix.  Well
one day I noticed what I thought was a cal deficiency so I went to the
hardware store and picked up some plaster of paris.  It is mostly calcium
sulfate with a little calcium carbonate.  So I started adding this to my
PMDD mixture.  Well I noticed that the mix, after a couple days took on a
somewhat red color.  Well now I am concerned that maybe this is "rusting"
my iron???  Without the plaster of paris mix, the PMDD remains a yellow