Beautiful. I particularly like the structure of your rockwork and the sinuous flow of coral up that left side. Maybe you should consider adding a macro or two, something more unique than caulerpa, such as some maidens fans, halimeda, or codifera. The contrast of the green calcareous algaes with your rock and corals would be very striking, the more so since you seem to have chosen your corals in the same color spectrum. Red gracilaria would also be a good choice, with its thin branches, and it would be in the same run of colors as your corals.