I have a corner tank too( 54g) and just built a simple box for my 250w halide. it's open in the back so i have plenty of air flow and it's great for heat escape. I just used 2-3 pieces of of regular 2x4x8. The front measures about 26'' long and the pieces are stacked 3 high on their sides for a height of 12" give or take an inch(wierd but when I measured the 2x4s they were actually 2x 3.5). The sides are about 12" long by 3 high again and I cut a piece of 1x6 that I used as the top. The halide and reflector is mounted to the top and the bulb sits approx 8" from the surface of the water. I used wood screws to put it together but hid them on the inside to make it look more clean. I also have a fan on the back that I actually unplugged because I don't need it. My tank sits around 76-78 when the halide is on. All materials ran me approx $25 plus a little more for a can of stain and it took about an hour to make using a skill saw and drill. It's nothing fancy but it does the job and actually looks pretty good.
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