You could have a couple of wrasses.
The smaller Halichoeres will work, these generally are;
Halichoeres iridis
Halichoeres leucoxanthus
Halichoeres chrysus
Halichoeres argus
Halichoeres biocellatus
Halichoeres cosmetus
Halichoeres claudia
Then there’s also the smaller Cirrhilabrus species that are like;
Cirrhilabrus adornatus
Cirrhilabrus lubbocki (Indo var.)
Cirrhilabrus hygroxerus
Cirrhilabrus naokoae
Cirrhilabrus afticanus
Cirrhilabrus rubeus
Cirrhilabrus finifenmaa
Cirrhilabrus exquisitus
Then you can also try things from the Macropharyngodon genus;
Macropharyngodon bipartitus
Macropharyngodon negrosensis
Macropharyngodon ornatus
Macropharyngodon vivienae
Macropharyngodon meleagris
Then there’s species from the ‘Pygmy’ Wrasses;
Wetmorella tanakai
Wetmorella nigropinnata
Wetmorella albofasciata
Pseudocheilinops ataenia
This is just a short list of species that will work, obviously each one needs their own research however Paracheilinus species are a bad idea as they are much more darty than others.