Awesome to see the final product. Did you happen to catch any shots of how you mounted the assembly into the housing? That's the part I never see anyone complete, and yet the part that concerns me the most (well, mostly because I've never seen it done).
By the way, you should probably tune your optics once you mount the unit at a specified height over the tank. That way you can control light spillage and ensure that you're actually *using* all of your usable light. Plus you'll need to make some decisions, such as whether you want continuous light coverage across the whole tank on prefer to spotlight certain areas more brightly than others.