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At only 7 inches wide that leaves you with roughly 11 inches on both sides of the fixture. The fixture might "cover" the fixture at full blast but you will have major shadowing and dark areas in my opinion. I have a 24 inch led fixture on a 36in tank (only 6 inches on each side of the fixture), and I had to take off the optics to get good coverage. With the optics on, the ends of my tank were dim, and I could only place SPS directly under the actual light.
The issue with leds are the "cone" of light they put out If you look at the picture they only cover directly under the fixture well. Imagine the cone coming from a 7 inch fixture for a 30 inch tank, the top edges of both sides of the tank will almost be in the dark in my humble opinion. It will cover the 30x30 at the bottom of the cone (bottom of your tank), but what about the rest.