🐠 Rock Beauty Angelfish (Holacanthus tricolor)
🐠 Rock Beauty Angelfish (Holacanthus tricolor)
A Bright Yellow Front With a Bold Black Rear Body • Sapphire-Blue Eye Accents • A Specialist Sponge Feeder From the Caribbean
📋 The Rock Beauty Angelfish has a striking two-tone appearance: a bright yellow head, front body, and tail, contrasted against a bold black rear body, with sapphire-blue accents around the eyes. Juveniles look completely different, starting almost entirely yellow with a small black spot that gradually enlarges as they mature.
It comes from the tropical Western Atlantic, including the Caribbean Sea and Gulf of Mexico, inhabiting coral-rich reefs and rocky outcrops, and it's the most common large angelfish across much of this range. Every Rock Beauty Angelfish we ship is feeding well, and it's a specialist sponge feeder, so we maintain it on a dedicated, ongoing supply of sponge-based angelfish foods offered multiple times daily, ideally alongside a sponge-rich refugium rotated into the display. We favour younger specimens collected from shallower water, which transition more readily than large adults.
It's not reef safe, and will nip at sponges, tunicates, zoanthids, stony and soft corals, and clam mantles. It's territorial toward other angelfish and should be the only angelfish in the tank, and very young specimens may also nip at the slime coats of tankmates. It reaches up to 20cm, so plan on at least 380L.
💡 Highlights
💛⚫ Yellow Front With a Black Rear: A bold, striking two-tone pattern
🍽️ Ships Feeding Well: Maintained on an ongoing, sponge-rich diet
🐣 Younger Specimens Favoured: They transition to aquarium life more readily than adults
⚠️ Not Reef Safe: Will nip at sponges, corals, zoanthids, and clam mantles
🐟 Territorial: Should be the only angelfish in the tank
🧾 A Quick Look at the Rock Beauty Angelfish
📛 Common Name: Rock Beauty Angelfish (Rock Beauty, Yellow Nanny)
🔬 Scientific Name: Holacanthus tricolor
👨👩👧 Family: Pomacanthidae
🌍 Origin: Tropical Western Atlantic (Caribbean Sea, Gulf of Mexico)
📏 Max Size: Up to 20cm (≈ 8")
🧂 Specific Gravity: 1.020-1.025
🌡️ Temperature Range: 24-27°C (75-81°F)
🧠 Care Level: Advanced; a dedicated sponge feeder
💖 Temperament: Semi-aggressive; territorial toward other angelfish
🌿 Reef Safe: No: will nip at sponges, corals, zoanthids, and clam mantles
🏠 Min Tank Size: 380 L (≈ 100 gallons)
📌 Tank Level: Mid to lower level
🧬 Stock Type: Wild-collected as standard stock; we favour younger specimens
⏳ Lifespan: Up to 15-20 years or more with consistent sponge-based nutrition
🍽️ Diet: Specialist sponge feeder (also tunicates, zoanthids, algae)
🐣 Reproduction: Harems of one male with several females

















