Thanks for the info guys, I was also wondering about the heat as far as how much it may heat the tank due to ambient room temp. I had a metal halide unit that heated up my room 8 degrees in a day, the $ x 96 watt pc fixture was a little more than 5 degrees a day, I curently have Aquactinics 36" fixture which only heats up the room less than 2 degrees. I was hoping to stay away from using a chiller again. Thanks.