I bought a flasher wrasse and thought for sure when he swam into my long tentacle anemone he was stung. he laid down in the corner of the tank and was very still. The next morning I looked and did not find him. (I got him on a Thursday, I think.) I never saw him the following day either. Sunday, I actually bought another one, acclimated. The following morning, I didn't see that one. Monday afternoon, both of them were swimming around happy as larks. Moral of the story? Be patient!
Unfortunately, both of them ended up jumping out.
You didn't mention what species you had, but all wrasses are jumpers by nature, so make sure you have a good cover. I'm setting up a 75 now and I just got done trimming light diffuser grating to make sure I don't have a repeat performance becasue those guys were my favorite fish I think I've ever had!