I agree that the leopard wrasse is probably easier to keep long term, but not in your tank. It looks fairly new, and leopards are very hardy once acclimated to tank living. This means an extended quarantine with prazipro (they are reputed to frequently carry internal parasites), and adjustment to tank food. However, they are dedicated browsers, and do best when the tank is mature and has lots of creepy-crawlies for them to pick on. Also, I saw that you were thinking of adding an anemone, which could be a problem since the leopard is not (I believe) reef safe, meaning that it may prey on the anemone. And don't get me started on bubble tipped anemones - they are great animals but they do present housing problems.