I would not recomend any Halichoeres or Macropharyngodon wrasse for a tank that size. While possible to get a juvenile Halichoeres, such as iridis or yellow coris, that could be housed in that sized tank briefly, it simply would outgrow it too quickly.
That size tank would not suppot the pods needed to keep even a juvenile leopard wrasse. Even if you find a juvenile eating well, they too quickly outgrow this sized tank, and still need a suitable amount of pods as their digestive tract is suited for near constant grazing.
The most suitable wrasses would be any of the wetmorella species or pseudocheilinops ataenia.
Sixline or fourline wrasses would also work for space, but can be very aggressive towards other fish.