If the tank is big enough a trio / larger group of Halichoeres will work. Halichoeres tend to be more mild-mannered and will tolerate similar species as long as they aren't too similar. I'd stay away from the bigger species, but have a trio of Canary, Xmas, and Vrolik's in my tank now. Just have to be careful that the fish you get are actually what you think they are - for example there are multiple species called 'christmas wrasse' in the hobby and one of them gets to be a foot long (and ugly) - you need to be extra sure you're actually getting Halichoeres ornatissimus which stays small (and gorgeous) and not a juvenile Thalassoma trilobatum. And I swear the importers just kinda... pick names out of a hat for these guys sometimes.