Well, now that I got the thing out of the box, I don't think it's going to work. It's by Cooper Lighting. With this fixture the bulb actually sticks out past the housing of the fixture, which means the bulb would be resting directly on the mesh on top of the tank. I have a Showcase Cage, so the fixture will not be mounted to the ceiling on the inside of the tank, it will be sitting in a cut-out on the top of the tank.
So, I think I'm back to the $43 one. Any other suggestions?
Thanks!