I tend to agree with you on the copper concentrations... If they where to be that high, keeping inverts would be quite hard. I have many differnt types and have no problems with them. 
 
The link to Reefs.org sounds interesting. I also find what was mentioned about the two other salts and the results posted also kinda fishy..('scuse the pun) 
 
Cheers 
Steve 
		
	
		
		
		
		
		
	
		
		
	
	
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