I had the same problem when we had a 55. We did have two light fixures, and one kind of hung off the edge a bit, not by much, but enough to annoy me.
Alex n Mary
150 gallon, 30g fuge/sump, 4.5 watt/gal VHO
Lighting, 4" sand bed, 290 lbs LR
, CDX-3 Nitrate/Phosphate filter
Female Naso "Isabell" or "Izzy", Emperor Angelfish, Flame Angel, Red Sea Sailfin tang "Bambi", Maroon Clown "Nani", 5 Chromis, 1 Aglae Blenny "Bengi" , Yellow Watchman Goby, pr of Banggai Cardinals, Lyretail Anthia, Six Line Wrasse
1 cleaner shrimp, Coral Banded Shrimp, lettuce nudibranch, 1 sand sifter stars, 1 tiny red brittle star "red", 1 tiny red and white banded serpent star, 2 tiny banded serpent stars, small orange Linkia starfish, assorted hermits and snails. Corals: star polyps, A ton of different types of mushrooms, yellow zooanthids, brown-orangish and light blue paly's, orange ricordia.
90g RR, W/D, 120 lb's LR
SF eel, pygmy angel, pr sebae clownfish, 4 chromis. Star Polyps & Mushrooms