I am in process of finishing my frag tank set up. I am trying to figure out how high I should hang my T5 lights over my frag tank. It is about 40 gallons, (48 long, 16 wide, 7 1/2 tall) and the light fixture has 4 (54 watt) T5's. The light fixture now sits about 2 inches from the top, but it is hard or close to impossible to get you hand in tank so I wanted to raise 5-6 inches. I wondered if this would be a bad thing?
I also was thinking about the lighting mixture? This tank is for mainly SPS and soley to grow corals. Should I use a 50/50 mixture of blue/white or a 25/75 mixture of blue/white. I want to optimize growth and still retain some color.
Any help would be greatly appeciated.