Yep two would cover that 150 nicely. But they were like $650 when I bought mine. I would keep the radions about 24-30" apart. Mine easily cover 36" which is the front to back on my tank but that on the sand bed so if you have rock structures near the end of that dimension keep that in mind as you won't get coverage there(hope that made sense) . I am debating adding some kessils sort of like what Louis is doing at his store but keep in mind I only have one sps and it was a hitchhiker. I'm all zoas/palys and LPS.