Sweepers are several species of small fish with big eyes due to their nocturnal lifestyle. They like clear, shallow waters where they hunt at night in the sand for tiny crustaceans and fish. They hide in caves in the day. They are often found with other small, big-eyed reef fish like Cardinalfish.

The Copper Sweeper is native to the Indo-Pacific. It has a coppery sheen and a black spot at the base of its copper-coloured pectoral fins. It grows to 20cm long.

The Blackstripe Sweeper is a silvery fish (the second photo above is reflecting red light), or sometimes a yellowish brown, with a thin black stripe between body and anal fin. Called the Silver Bullseye in Australia, it grows to 15cm long. It is native to coasts and reefs of the tropical/subtropical Indo-west Pacific and feeds on zooplankton at night, hiding in crevices by day.
(The similar African Silver Sweeper or Tominaga's Sweeper, P. tominagai, is also sometimes called the Blackstripe.)