I built a canopy with doors in it when I started my tank. it is about 18 inches tall X the width and length of the tank. The lighting unit is hanging from the top of the canopy. I painted it white to help reflextion on the light to go down into the water. I was thinking what about flashing. do you think that would work better? will in rust being so close to salt water? It there a reflective material like a mirror that I can use that will not rust? It will be inclosed so it doesn't have to be pretty, but I do want to be price cautious.