I decided to open up the tank from the Den. It's difficult to perform tank maintenance, as well as aquascaping the view from the Den. This should resolve these issues.
I cut out the gyprock, framed it with wood, and attached it using a hinge.
I needed new Metal Halide bulbs and decided to change to the Reeflux 250w 20000K SE bulbs. I've heard a lot of good things with this bulb. Most 20000K bulbs are too "blue" and dark, however, this bulb looks closer to a 14000K bulb. As well, it has more par than its 12000K counterpart.