Thanks to everyone for the suggestions and ideas. Because I had already run the line I decided that the simplist solution was to drill a small hole in the line as a siphon break. This seems to have worked perfetly - total time involved was less than a minute. Thanks Dave for the advice. 
		
	
		
		
		
		
			
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				90g mixed reef (eventually!); 23g sump; 20g QT; Waveline DC-5000 return; 2 Radions; 2 Vortech MP10s; Koralia 3; ELOS ATO with 14g ATO tank; RLSS R8 skimmer; BRS reactor - GFO/Carbon; filter socks; Puratek RO/DI
 http://www.canreef.com/vbulletin/showthread.php?t=85303
			 
		
		
		
		
	
		
		
	
	
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