Josh, I almost cant see the sand behind my rock work anymore cause it's so covered with feather dusters.
theirs no problems with them and I believe it to be a fairly good sign of a healthy tank. 
Unless you have a copper banded butterfly, your tank will have no dusters but may still be healthy 

 
		
	
		
		
		
		
			
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				No matter what the morrow brings, inventors keep inventing things.
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Jonathan
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