I'm using this same fixture on a 47G reef/fish tank myself. Nicely built with separate power cords for antic and true daylight bulbs. It's sufficient for my needs mostly
soft corals. If you plan on
SPS corals and or exotic clams then you should consider Metal Halide fixtures. Actually Coralife makes a pro version of the light your getting that has MH lamps in it, mind you the price doubles, also more heat is generated!
But again if your future plans are for keeping some of the more light demanding specimans it might be worth spending more now than having to dish out a bigger amount later!