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					Originally Posted by  Canuckgod420
					 
				 
				what is this Randys 2 part? 
			
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 http://www.reefkeeping.com/issues/2006-02/rhf/index.php
Works well and saves lots of money. Check out the ChemMaster aka littlesilvermax who is a vendor sponsor on here if you are looking for calcium or magnesium.