I run a Berlin style reef. I had read about them and could not believe they worked so I tried one for myself. It has been running 4 years now, and hosts purple tangs and acopora. The key is lots of live rock, the best protein skimmer you can afford, and carbon. It lacks any mechanical filtration. I am a big fan of Klaes skimmers, they are german made and they are all I run and sell.
Aaron <img src="graemlins//eek.gif" border="0" alt="[eek]" />