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Fertilizer question

Recently I purchased a jug of chelated iron solution for my plants.  I found 
that it was much cheaper than buying the plant specific iron sold in pet 
stores.  The problem is that it also has several other micronutrients in it 
including copper.  There is only .12% copper, but it says that it comes from 
copper sulfate.  I know that copper sulfate is often used to kill unwanted 
plants and algae in ponds, but it is something like 80% copper sulfate.  
Would this small amount be damaging to my plants?  I have been using it for 
awhile already and haven't noticed any problems.  Any advice would be 

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