School of damsel fish (including Neopomacentrus sp., Pomacentrus sp. and Chromis sp.)above a hard coral reef (Acropora sp.). These fish feed on plankton drifting past in the current. They dart back into the shelter of the coral at the slightest hint of danger. When schooling, their motion may make the coral reef look like it is moving. Photographed in the Tydeman reefs, West Papua in Indonesia, Asia.