Vanikoro Sweeper

Found in schools, during the day sheltering in caves, under ledges, around harbours, and shipwrecks, dispersing at night hunting for food, high above the bottom, over shallow coral and rocky reefs.

This is the largest Sweeper.

Sweepers school during the day, but at night they float high above the bottom to hunt for larger zooplankton.
Several species are triangular shaped.