Sorry if this post is long butttttt.
I had one in a 55 and I would agree with Purple Haze in that they will eat pods at first. In fact, my wrasse picked at anything that moved in the tank and was small enough to fit in his mouth. This even included my snails antennas.
Eventually my tang showed my wrasse how to eat nori and he was easily fed off that. The pic above is not a typical leopard wrasse, it is much nicer than what you normally find. Also, these guys like sand beds because they will hide under rocks at night. In fact my wrasse would go under the rocks within 30 seconds of the lights going off! It was amazing. I wish I could go to sleep that fast.