I like keeping fish in groups (note I'm avoiding the 'shoal' word

) I have in the past kept Splendid Leopard (Macropharyngodon bipartitus bipartitus), Leopard (M. meleagris), White belly yellow wrasse (Halichoeres leucoxanthus). I currently have a trio of Timor wrasse (H. timorensis). All the species lived together and tolerated each other, in the case of the Splendid Leopard and Leopard wrasse I did end up with a harem (1M and 3-4F). My Timor wrasse breed weekly, I have a male and 2 females.
Except for the males showing to the females, once they have sorted a hierarchy (I got a bit of handbags in the first few weeks) the wrasse tend to ignore each other and wander all over the tank, so if you want them to shoal or group, it doesn't happen.