I have used it in the past on a couple of small nano tanks that I set up.  The only thing I can really say is it didn't hurt anything.  I don't know if it made my coralline grown any faster but I did have nice coralline growth in the tank.  I use it on my work tank more to maintain calcium as I have a clam in there. 
		
	
		
		
		
		
		
	
		
		
	
	
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