Recieved my Silicate test kit today and was hoping for some answers. 
 
Unfortunately I didn't get many, other than Silicate is not the problem.  Both my RO/DI water and my tank water readings are 0. 
 
I am happy though that my Silica based sandbed is not leeching a lot into the water.  (Black Tahiti Moon Sand) 
		
	
		
		
		
		
		
	
		
		
	
	
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