An elegant reef worm
This is one of many species of syllid worm, a type of worm that crawls (yes, with little "feet") its way around sponges, ascidians, hydroids, bryozoa and algae, which they feed upon by piercing their sedentary prey's skins and sucking out the "life juice."
Granted, not all worms are beauty pageant contestents. But you have to admit the stripped monochromatic pigmentation of this particular syllid is rather striking and its movement rather graceful. Reef life is remarkable!
Video by liquidguru