Same here sometimes you get some dead spots for a variety of different reasons, and they will recover and grow back if your tank is running right. 
		
	
		
		
		
		
			
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				150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller 
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
			 
		
		
		
		
	
		
		
	
	
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