Garibaldi (Hypsypops rubicundus) are territorial fish. Males will clear bottom territories and combat other fish and even SCUBA divers that come too close to their territory. However, it is uncommon that there is intraspecfic aggression; Garibaldis generally “respect” each other’s territories, so there is no need for aggression within species.
[Photo by Nick Chudeau and caption by Karli Chudeau]
Clarke, T. (1971). Territory Boundaries, Courtship, and Social Behavior in the Garibaldi, Hypsypops rubicunda (Pomacentridae). Copeia, 1971(2), 295-299. doi:10.2307/1442830