Sump/fuge for a large cube

[TheReefGeek]

I assume the cube is going to be a walk-around, not up against the wall, so having a fuge above the display might not look so good. Unless you did a secion of drop ceiling to put both the lights and a fuge in, with an access panel on one side....... Wouldn't cost THAT much to get a drywaller to do for you, then you could go with retrofit kits for lighting, save a bit vs. pendants or full fixtures.