They are flashers, and I cannot tell exactly what species they are, but perhaps Paracheilinus carpenteri, flavianalis or mccoskeri. Note that they have a rounded tail.
Indian Ocean; mccoskeri
Indonesia & Western Australia; flavianalis
Pacific; carpenteri
The species probably is one of the mccoskeri- complex so they might be attenuatus (Kenya & Seychelles), or rubricaudalis (Fih\ji & Vanuatu), but I am not sure.