Razorfish darting between corals

A school of vertically swimming Jointed Razorfish, aka Coral Shrimpfish, drift in the current. They swim in a head-down tail-up position and with the back facing the direction of travel. Jointed Razorfish are often seen in schools darting between coral branches or to hide among the spines of sea urchins.
 
Scientific Name: Aeoliscus strigatus