Thanks for the quick info. I'm in the process of testing temp variances throughout the day, before I order my lights. I seem to be able to keep things around to 80 degree mark +/- 2 degrees.
Got all the lights in 6 x 54watt T5's. With fans I have held 80 deg +/- 1 deg for the past three days. I can mount the ballasts outside the tank hood and get the temp down to probable 77 or 78. Is it worth the trouble to drop the temp 2 degrees or is 80 ok ?