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					Originally Posted by  MikeP
					 
				 
				I used a liquid additive called DKH plus for a while (can't remember the brand name, I bought it at Elite though). On a small tank like yours a bottle would last quite a while and as I recall it wasn't too expensive. 
			
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 That would Be Tailored Aquatics dKH Plus and yes a bottle does last a small tank quite a while. 
http://www.tailoredaquatics.com/index.html?a=0&d=43