I am looking for a good PC fixture for my 20L (30 inch long) tank. There are freshwater aqualights that have 2 65 watt bulbs, BUT, the bulbs seem much much shorter than the fixture, about 24 inches or so. My friend has a 30 inch long fixture, and his two bulbs are "staggered"..... one comes from one end and the other screws in the other end, this way, there isn't a large gap on one side since the bulbs are shorer than the fixture. However I can't find any fixtures like that. The picture show that the bulbs are on one end, causing what looks like a large gap on the other end of the fixture. I would prefer the staggered style if I could find them....does anyone even know what I'm talking about?