Rock Beauty
Holacanthus tricolor
Also known as: Cocobatta or regional variant of a West African name; unclear scrape, Corn Sugar
A bold Atlantic angel with dramatically different juvenile and adult coloration.

About
The rock beauty (Holacanthus tricolor) is one of the more recognizable angels from the Western Atlantic, ranging from the waters off Georgia and Bermuda down through the Gulf of Mexico and all the way to southern Brazil. Adults are hard to miss. The front third and tail of the body are vivid yellow, while the rest is deep black, making for a sharp two-tone look that's unlike most other angels in the trade. Juveniles look completely different, showing mostly yellow with a small blue-ringed black spot that gradually expands as the fish matures. In the wild, rock beauties favor rocky reefs, jetties, and coral-rich zones, and young fish are often found hanging around fire corals. Their natural diet leans heavily on sponges and tunicates, which makes them a challenge to convert to prepared aquarium foods. This is probably the biggest hurdle for keeping them long-term, and it's worth researching before purchase. Behaviorally, they're semi-aggressive and can get territorial, particularly toward other angelfish, so tankmate selection matters. They grow into substantial fish and need a roomy setup to thrive. Despite the listed beginner care level, the dietary conversion issue means they reward patient and attentive keepers.
Similar species
Other fish you might consider
From the same region
Share the same natural habitat. Great for a biotope-themed tank
Frequently asked questions
- How big does the Rock Beauty get?
- The Rock Beauty reaches about 8–10" as an adult.
- What size tank does the Rock Beauty need?
- A minimum of 120 gallons is recommended for the Rock Beauty.
- What water parameters does the Rock Beauty need?
- The Rock Beauty does best with a temperature of 72–82°F, a pH of 8–8.4.
- Is the Rock Beauty aggressive?
- The Rock Beauty is semi-aggressive. It can work in a community with careful tankmate choices and enough space.
- What does the Rock Beauty eat?
- The Rock Beauty is an omnivore. It does well on a varied diet of quality flake or pellet plus occasional frozen or live foods.
- How long does the Rock Beauty live?
- With good care, the Rock Beauty typically lives 10-15 years.
- Is the Rock Beauty reef safe?
- The Rock Beauty is not considered reliably reef safe and may harm corals or invertebrates.