OK, this may not be the greatest reef on the planet, but it's proof that it is possible to run a reef without a skimmer. I have a DSB, an algal filter and liverock as filtration. the pictures that follow were taken in December 2008. The first algal filter was introduced in about August 2008. I removed the skimmer totally on the 10th of Jan 2009 when the algal filter was running well. December 2008: Still with a skimmer: I'll take some photos soon so that you can see the difference in SPS colours. I'll also take photos of the algal filter.