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			 I used a nail brush,took for @#$%$## ever,but worked well.Took alot of coraline off too.Ive also flipped the rock over so the algae is burried in the sand.That works good if you only have a few tufts to get rid of.Maybe a small cycle if you do that tho. 
		
	
		
		
		
		
			
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