According to Wikipedia, the following wrasse are corallivores:
Diproctacanthus xanthurus (Obligate)
Labrichthys unilineatus (Obligate)
Labropsis alleni (Obligate)
Labropsis australis (Obligate - anecdotal)
Labropsis manabei (Obligate - anecdotal)
Labropsis micronesia (Facultative - anecdotal)
Labropsis polynesica (Facultative - anecdotal)
Labropsis xanthonota (Obligate - anecdotal)
Larabicus quadrilineatus (Obligate - apparently it's a cleaner as a juvenile and an obligate coral eater as an adult)
Choerodon graphicus (Facultative - ~%5 of its diet is stony corals)
en.wikipedia.org