I'm wondering if anyone else has tried using a Jaubert-style filtration system with their ceph. I have a friend that has run one for some time on their reef tank with much success. If you're not familiar with it, here's a good article: http://www.advancedaquarist.com/issues/sept2002/feature.htm The short story: The idea behind the system is to create a relatively thick bed of sand over a gap in the water, such that the water under neath is poorly circulated. Supposedly this arrangement causes denitrification to occur very efficiently. I'm not saying I want to run just this system, but perhaps utilize it instead of buying live rock. I plan on running a skimmer full time regardless, as I don't believe anything can live up to the chemical filtration it provides.