i think the best idea to have a good filtration with liverock and live sand is following mikes custom and well you dont need the refugium that he did but maybe later on cause the chaeto really helps so here are the links of mike system of filtration
http://www.nanotank.com/forum/viewtopic.php?t=644
in other words works great ...
and resuming is like these
chamber 1: sponge , chemi-pure (small one if posible there are two sizes) and sponge
chamber 2: live rock (and chaeto if have a refugium light)
chamber 3: heater, pump (to update a mini jet 606 works great), liverock (and chaeto if you have refugium light but at the same time i dont recomend having chaeto were the pump is why? cause i did it and now im having problems with it cause the pump gets stuck with macro and i have to keep cleaning the pump every other month or so)
so i think best way is to do like stated without the chaeto for know :lol: and also i like to put a piece of poly filter in chamber 3 close to the flow windo between chamber 2 and 3 just in case if a chemical gets in your tank the poly filter will take care of that (what is a polyfilter is a smoge that lfs sell looks like a white sponge) i cut the polyfilter in 3 pieces and change it every 3 weeks or every month and the chemipure every 3 months or less ....
know please nano experts corrections if needed
ed