I have to put 2 of these disks in at the same time, I don't even get it n the suction cup before my fish try to attack it. They don't have time to break up before the fish totally devour it. I do notice that the tank gets a little cloudy during the feeding feast but it really doesn't bother me that much. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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