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All Pomacanthus species have very similar juvenile coloring, a series of thin white or light blue stripes against a dark blue background. Two fish with dramatically different adult coloration, for example the blue-girdled and emperor angelfish, look so similar as juveniles that only an expert could tell them apart.

Damselfish. These small, ubiquitous fish (family Pomacentridae) are members of one of the largest groups of tropical reef fish. In addition to the reef itself, they occur along rocky shores, algal flats, and even in silt-choked harbors. The damselfish feed on plankton and algae, some even setting up small territories from which they aggressively keep all herbivores away, "farming" the algal turf that then grows on the coral rock.

The black and white three-striped damselfish (Dascyllus aruanus), the blue devil (Chrysiptera cyanea), and the blue damsels (Pomacentrus) are common among the coral heads and rubble of the shallow reef. The pugnacious black farmer fish (Stegastes lividus) also defends its patch of algae in the shallows.