Pempheris oualensisis commonly referred to as Silver Sweeper, Oualan Bullseye, Blackspot Sweeper, Cave Sweeper, Copper Sweeper, Keeled Sweeper . Difficulty in the aquarium: Not for beginners. A aquarium size of at least 1000 Liter is recommended. Toxicity: Toxic hazard unknown.
Occurs in clear, shallow lagoon and seaward reefs, quite common along the reef margin.
Feeds on benthic and planktonic crustaceans, other small invertebrates, and fishes at night. By day, it forms aggregations in caves.