Bought the Deluxe BRS reactor a number of years ago.  I've run it for GFO and Carbon through the years.  I have had the issue of air and the level drop.  Mine has an air bleed at the top in the form of a red button.  When i get the problem you describe...I push the bleed and the level goes back up.  You can't hold it long or water comes out the bleed nozzle. 
		
	
		
		
		
		
			
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				Mark...
  
290g Peninsula Display, 425g total volume.  Setup Jan 2013.
			  
		
		
		
		
	
		
		
	
	
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