Quote:
	
	
		
			
				
					Originally Posted by  StirCrazy
					 
				 
				don't want to use a timer as your skimmer is adding O2 to your water also.  people have had mysterious fish deaths and discovered it was due to the O2 levels dropping when there skimmer was off at night. 
 
Steve 
			
		 | 
	
	
 Yes, I did mention this potential issue in my suggestion to the OP on RC.