The Herbie system is the safest and quietest method of doing an overflow....its totally a gravity feed, no gurgling, no fiddling with vent hole sizes, no back pressure....it will cost you probably around $80(cost of the extra hole, a few plumbing parts and a gate valve) more to do a Herbie, but well worth the investment IME....the link in your last post has lots of good tips and info....if you have any other questions about it or need more detailed pics, just ask.
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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
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