My original power heads were very open and my clowns hosted it with no issues at all even after it shut down and started up on its timer the clowns seemed to know when to get out of the way. My new power heads are fully enclosed and the clowns sit under and beside it all the time still 
		
	
		
		
		
		
			
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				 My aquarium is nothing but a smorgasbord for my cats.....
			  
		
		
		
		
	
		
		
	
	
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