Pomacentridae
They are mostly marine, while a few species inhabit freshwater and brackish environments (e.g., Neopomacentrus aquadulcis, N. taeniurus, Pomacentrus taeniometopon, Stegastes otophorus). They are noted for their hardy constitutions (body functions) and territoriality (where they live).  Many are brightly colored, so they are popular in aquaria.