Easiest cheapest and quickest lighting is to buy a fluorescent light from a hardware store and an extension cord. That all depends on what your planning to put in the tank. For freshwater this setup would be ideal. I would suggest a four lamp fixture for that big tank. It's a simple case of cutting the female end off the cord( the end without prongs) strip some of the outer insulation back and put it into the fixture, use a wire connector like a 40/40 also available at the hardware store. Connect the green to the ground screw, black to black and white to white. Once the lamps/bulbs are in plug it in and off ya go. If you build a canopy this can easily be screwed on to the underside.