The Pyramid Butterflyfish (Hemitaurichthys polylepis) is a striking reef fish known for its triangular white body patch that resembles a pyramid, contrasted with yellow fins and a dark face. It inhabits tropical Indo-Pacific coral reefs, often found in large schools near drop-offs and outer reef slopes. This species feeds primarily on plankton, making it a midwater forager rather than a coral grazer like many other butterflyfish. It is peaceful and relatively hardy, making it a popular choice for marine aquariums. Pyramid Butterflyfish are also indicators of healthy reef ecosystems due to their reliance on clear, plankton-rich waters.