I have them as well like that and have had them for a while now.... 
I got a Nudie to eliminate them. 
Unfortunately  he did not get all of them so I still  have them.  
And in taking this picture I also noticed that I had Zoe eating nudies seen in brown on the right side top.  
  
		
	
		
		
		
		
			
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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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