Can lights with led bulbs would he a good way to do this. The cans can be placed in a fur down or canopy on the ceiling and the whole thing can be put together for only a few hundred bucks along with some basic contracting skills.
This is the route I am taking now, it was the only way I could find to correctly light my new tank build without putting any lights directly on top of it. By using the can setup you'll also be able to use the eyeball trim rings that will allow you to aim your lights.