I have recently seen the tank of my dreams, and my girlfriends (which is very important), and now have a question about my lighting as it relates to the corals I would like to keep. In my original lighting scheme I planned 2X55 watt PC and 175 watt metal halide for a 40 gallon tall. But after seeing a tank set up with zoos and ricordia like I would really like to do, and noting that the owner olny use PC and NO flourescents. I am wondering if I should go with the metal halide or not? 4X55 watt PCs would give me 11 more watts porportianly then him, but I worry with my tank being 16 inches tall that I would not get enough light penetrating to depth. Here is a link to the tank http://www.reefkeeping.com/issues/2004-08/totm/index.htm Any thought from people that keep these type corals or a setup like this?