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					Originally Posted by  TimT
					 
				 
				Not all the bacteria will be floating in the water column. Many are attached to a substrate... like a bio pellet or live rock or inside of pipes etc etc.  
  
I dose sugar and vinegar and run a UV and it works fine. 
			
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Dosing sugar and vinegar ? Never heard of that, but I had a chance to look at the color of your corals picture before, they are amazing.