an X-mas wrasse is not a good reef fish. i would say stick to fairy wrasse, six line, 4 line, corris or flasher wrasse. although even a flasher and fairy wrasse prefer a bigger tank. there are others you could try but they are abit harder to keep and even harder in a smaller tank.
lastly make sure you have a very tight fitting lid on your tank before keeping any kind of wrasse as they will end up jumping sooner or later. every wrasse i have ever kept has ended up jumping. even when i had a top my mystery wrasse ended up jumping thru a small hole i ould have never though he could have made it thru or would find.