Redcoat Squirrelfish

Found singly, or in schools, sheltering during the day, around caves, cracks, and crevices over areas with strong currents, dispersing at night foraging for food in silty bays, harbours, lagoons, coastal reefs, and around wrecks.
They feed nocturnally on crustaceans and small fish.

Mediterranean migrant via the Suez Canal.

Squirrelfish are nocturnal hunters feeding near the bottom on small fish and swimming crustaceans. During the day they often congregate close to reefs and in caves, sometimes found upside down in caves.
Their colour can change greatly in different lights and if threatened.
Some of this family have venomous spines.