Yellowline Goby

Found singly, or in pairs, always living in association with tube sponges or massive sponges. Difficult to approach!
They feed on benthic invertebrates, plankton, but mainly the parasitic worm Haplosyllis spongicola, that lives in large numbers on their host sponges.

Cleaner gobies stay around "cleaning stations" where they wait around for fish to come along to be cleaned by removing ectoparasites from their bodies.