I use a 1600 GPH submersible and it is not bad. Slight hum when it comes detatched from the bottom but when it is secured it runs pretty quiet. Has been used for about four months. Pond Pro series, got it for like 130 bucks. 
 
My $0.02 
Mike 
		
	
		
		
		
		
			
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				This all started with a ten gallon and two clowns.
			 
		
		
		
		
	
		
		
	
	
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