I have the 72" Nova Extreme Pro with 12 T5's. I'm way overdue for new:thumbdown bulbs. Changing the bulbs on this fixture isn't exactly like changing a table lamp, so replacing them 2 at a time would be a real pain. Can I raise the fixture 4-5" and reduce my time by a couple of hours a day? I was also thinking about placing some dark window screen over the tank? Any advice is appreciated.