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Copper in food killing Amanno Shrimp?

The ingredient lists Copper Sulfate as a main ingredient. Copper is 
poisonous to invertebrates such as algae eating shrimp. There is always 
left over food that the shrimp eat. The shrimp seem to be disappearing. 
Is this a reasonable conclusion?

Spectrum Food by New Life and distributed by SeaChem is a great fish 
food. Anyone else uses the Spectrum line of foods (they all contain 
Copper) have any problems with Amanno shrimp?