There's nothing wrong with bloodworms as part of a diet but I wouldn't do them as the only food source.  Personally I don't do anything as a single main food source.  I change it up with a mix of different frozen foods and different pellets.  A real variety of things so the fish have different meals on different days. 
		
	
		
		
		
		
		
	
		
		
	
	
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