Go for the six-line wrasse. They are very smart, active and inquisitive and will find every nook and cranny of rockwork they can fit through. Since their markings and behaviour are so different from the clowns the six-line will compliment your tank very well. I have had two. One became oversized cleaner shrimp food not long after I got it. The other I kept for close to a year until I left the hood open one night and found her on the floor in the morning. She would do circles and play in the powerhead current and would eat from my hand; sorely missed. I would have another one right now if I had the room.
Anyone want a scribbled rabbitfish?
