It's an odd-sized tank I bought from someone on Craigslist that was leaking. I resealed it, and started purchasing supplies. I tested for leaks for about a week, and built a stand for it since I couldn't find one long enough for a reasonable $$$. It's 56" long, and measures about 62 gallons.
I was just going to place the light in the center of the tank, and keep the plants near the center under the light since the fixture will actually be 8" short (4" per side).
I haven't found a light longer than 48" at any LFS
that wasn't over $250.
BTW, thanks for the welcome!