The Johnston Damselfish (Plectroglyphidodon johnstonianus) thrive in Acropora reefs in the Indo-Pacific. Their  body is golden-brown, with blue eye lids and a large black stripe just before the caudal fin. They feed on crustaceans, algae, and occasionally polyps of SPS corals, so it is recommended they are kept in a system without SPS coral. Reaching a maximum size of nearly 6 inches, they should not be kept in a system smaller than 50 gallons, and should be fed a well mixed diet of crustaceans and algae. The Johnston Damsel, like many other Damselfish, may be aggressive or territorial towards other fish in the aquarium, especially if they are spawning.