i have never heard of any Halichoeres or Thalassoma wrasses schooling (and i doubt they would). Fairies and flashers, yes, but they are of a different genus entirely.
I assume the "banana wrasse" is a canary wrasse (Halichoeres chrysus)?
this is a 230g right? Im betting it would be fine if they are all the same size. Of the three the aggressor is the lunare, then the red coris, and the Halichoeres chrysus is a peaceful pansy; I would introduce slowly and in the opposite order. The others might pick on the banana wrasse but I wouldn't really expect it. the red coris and lunare can probably withstand any aggresion from each other, but keep a close eye, especially on the lunare.
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