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					Originally Posted by Myka  Doug, airline tubing is 3/16", not 1/4". | 
	
 well, the OP did ask for rigid tubing, not airline, so I just assumed that he meant the rigid 1/4 line that you see on R/O units

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				260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065,  2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa). 
http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here 
http://www.vimeo.com/2304609 and here 
http://www.vimeo.com/16591694