I had 2 150w x giessman 13k in my 48"X16"X22" bowfront tank (72 gal) and had no problem with sps...
I never tried them lower than halfway down, but I had great color moderate growth and every one of them encrusted to the rock they were glued to.
I DID have to go with a little yellower/whiter light than I wanted to get better penetration and spectrum but all in all, I was surprised by how well 2x 150 w de halides worked for this size tank.
don't get me wrong, I upgraded, but for the price he's charging, you can afford to later too IMO.
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