I would highly recommend looking into some wrasses, your tank is large enough for nearly all of the reef-safe wrasses. Fish in the Cirrhilabrus genus and the Paracheilinus genus will do very well in your tank, as well as a couple of fish from the Halichoeres genus as well. I would highly recommend a Mccosker's flasher wrasse(Paracheilinus mccoskeri) or a Melanurus wrasse(Halichoeres melanurus). Both of those fish are easy to take care of, not too expensive, and will be truly stunning in your tank.
Great looking tank, really like your bubble coral!