The other night, I watched the Naso Tang chasing a Solone Wrasse. Not in an aggressive way. It was like a tailgater that forces you to speed up. They went for at least 4 times around my 8' tank. There was a piece of poop sticking out of the wrasse's butt, and the Naso wanted it. My better half didn't believe me when I told her that the Naso is not being aggressive, he just wanted the poop. She was so disgusted when she saw the Naso eating the poop.....lol