Also known as Bullseye, Glass Sweeper, Glassfish, Glassy Sweeper, Pigmy Sweeper, Slender Sweeper.
Found in dense schools, often sharing their space with other fish, and moray eels, in and around caves, under ledges, and overhangs, of coastal, and off-shore reefs.
They feed nocturnally on zooplankton.
Length - 5cm
Depth - 2-55m
Widespread Western Indian Ocean
Sweepers school during the day, but at night they float high above the bottom to hunt for larger zooplankton.
Several species are triangular shaped. Ref: https://www.fishbase.se/summary/68450