As part of being a responsible reefer and global citizen, and to put my money where my mouth is so to speak, I have resolved to decrease my "carbon footprint" to borrow an Al Gore term and become more "carbon neutral" (see http://www.climatecrisis.org/). So recently I have added new insulation to the attic, replaced some windows, changed out all incandescent bulbs for flourescent bulbs, and this week I traded in my Toyota Forerunner for a Toyota Prius Hybrid (rated at 51 to 60 mpg). My next challenged is to eliminate my 75 gallon softy tank (for which I have a potential buyer) and think of ways to decrease energy utilization in my 125 gallon SPS tank. I have even consdered takng that off line. The energy consumed by our tanks produces thousands of lbs of CO2 emmissions. I know one alteration is to replace halides with T-5's. Any other suggestions on how to (cheaply) reduce power consumption in reef tanks? I don't want to come off as a cusader, and I don't want to tell or judge others by their choices, but I figure any little thing we can do as individuals just might make a difference.