This pair of Harlequin Ghostpipefish - Solenostomus paradoxus seems to have their colours mixed up.
Usually, once they are settled to the coral reefs, they will take on the colours of their surrounding, be it Feather Stars, Crinoids or other corals. However, this pair is yellow/green and the other black.
The ornate ghost pipefish or harlequin ghost pipefish, ''Solenostomus paradoxus'', is a false pipefish of the family Solenostomidae. The species name comes from the Greek ''paradoxos'', referring to this fish's unusual external features. Ornate ghost pipefish are found in the Western Pacific and the Indian Ocean along reef edges prone to strong currents.