Rock Beauty Angel (Bloch, 1795)
| Scientific Name | Holacanthus tricolor |
| Diet | Herbivore; algae, sponges, tunicates |
| Alt Common Name | Yellow Nanny, Coshubba, Nuriwake-yakko (Jap. 'parti-colored valet') |
| Family | Pomacanthidae |
| Origin | W. Atlantic |
| Aquarist Level | Intermediate |
| Reef Safe | With Caution |
| Coloration | Yellow and Black |
| Disposition | Generally Peaceful. |
| Hardiness | Moderate |
| Compatibility | Peaceful with other species. Aggressive with own species |
| Mature Size | 10 inches |
| Sexual Dimorphism | Males tend to have brighter coloration. |
Notes: Large angels may nip at soft or hard corals. Caution is advised when adding to a reef aquarium. A larger aquarium (75 to 125 gallon plus) is recommended for housing large angels. Juveniles associate with fire corals.
Most Holacanthus angels undergo a color change between the juvenile and adult stages of life.