I would do the A350W, which has a wider lens angle and would work great for your tank. Several places carry them. I purchased mine from Marine Depot. Since I am covering a 24x24x24, I got the straight A350. All of my corals are loving it except the colt coral. Go figure. I started it at 35% on both channels and I am up to 45%. Im not going to increase it again until my colt decides what it's doing. But all of my LPS, SPS, zoas and clam are super happy. Check out the new light on my cube thread :D