I have a 29 gal.
I've heard cleaner wrasses are hard to keep, but that was my first fish when I was FO, and it was a great hardy little guy. IMO, no FO tank is complete without one. However, I've been told by a LFS owner that cleaner wrasses have been known to pick at coral polyps. So if you have corals, it might not be a good idea.
As for the anthias, I don't know. I had a 3 in little pink anthias and it was so, so cool, and very hardy. It would yawn and show how gigantic its mouth was. So neat!
They all died, together with 3 other fish, the morning after their first live brine shrimp feeding (which was not excessive). Don't ask me what it was, I fed at night, and in morning, all dead. It is still a mystery to me, as all the typical chemical levels were fine.
sam