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Part of the reasons most fertilizers have copper is to kill the fungus. I don't know, I'd feel a little odd using miracle gro in my phyto cultures too, but I feel better about it when I think of the incredible amount of toxins in the ocean. Most of us forget that nutrient poor and pristine are hardly the same thing.... marine life can be more forgiving than we think. I mean, look at all the flame retardent levels in our Oregon salmon and steelhead? Who needs to worry about spontaneous ignition after eating that?!!
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