Fasciatus Butterfly

Description

The Chaetodon fasciatus features a deep, laterally compressed body with a brilliant yellow base colour crossed by bold, narrow, vertical black bands. A wide black mask covers the eyes and forehead, bordered by a white band that gives it the “raccoon” appearance. The dorsal and caudal fins are bright yellow, while the posterior edge of the body displays subtle orange highlights.

This species grows to a maximum length of 20–23 cm (8–9 inches) and moves gracefully through midwater zones, often in synchronized pairs. Its stunning contrast of colours and distinctive facial markings make it a true showpiece in any large marine display.

Aquarium Requirements

Minimum Tank Size: 450 litres (120 US gallons)

Temperature: 24–28 °C (75–82 °F)

pH: 8.1–8.4

Specific Gravity (Salinity): 1.020–1.025

Alkalinity: 8–12 dKH

Ammonia & Nitrite: 0 ppm

Nitrate:< 20 ppm

Aquascape and Environment:
Provide a spacious aquarium with ample live rock for grazing and exploration. Include a mix of open swimming areas and caves or ledges for retreat. The Red Sea Raccoon Butterflyfish appreciates moderate to strong water flow and high oxygenation.

This species requires a mature, stable environment with established biological filtration and plentiful microfauna. It thrives in clean, stable systems with frequent, high-quality feeding and minimal aggression from tankmates.

Diet and Feeding

In the wild, Chaetodon fasciatus feeds primarily on coral polyps, small benthic invertebrates, and algae. In captivity, it can adapt to prepared foods, though acclimation may take time and patience.

Recommended Foods:

• Frozen mysis shrimp, enriched brine shrimp, and finely chopped seafood (clam, shrimp, squid)

• Sponge-based frozen foods designed for butterflyfish and angelfish

• High-quality marine omnivore pellets and flakes

• Live blackworms or small clams to stimulate feeding during acclimation

Feed 2–3 times daily in small, varied portions. Frequent feeding encourages active foraging and helps reduce the likelihood of coral-nipping behaviour.

Temperament and Compatibility

The Red Sea Raccoon Butterflyfish is peaceful and generally well-behaved, though it may become mildly territorial toward similar-looking species. It can be kept singly, in bonded pairs, or in small groups in very large aquariums.

Suitable Tankmates:

• Peaceful reef-associated fish such as tangs, wrasses, anthias, gobies, and angelfish

• Other butterflyfish in spacious systems (600+ litres)

• Peaceful invertebrates like shrimp and snails

Avoid:

• Aggressive or fast-feeding species (e.g., triggers, large wrasses, or groupers)

• Other raccoon-type butterflyfish unless the aquarium is exceptionally large

Reef Compatibility

⚠️ Not Reef Safe

The Red Sea Raccoon Butterflyfish is known to feed on coral polyps, tube worms, and other sessile invertebrates. While some individuals may be less destructive than others, it is best regarded as unsuitable for reef aquariums. It thrives best in FOWLR (Fish-Only With Live Rock) setups, where it can exhibit its natural grazing behaviour without risk to corals.

Additional Information

Maximum Size: 20–23 cm (8–9 inches)
Lifespan: 8–12 years in captivity (with excellent care)
Difficulty Level: Moderate (requires stable conditions and proper diet)
Natural Behaviour: Active swimmer, diurnal grazer; often seen in pairs or groups
Origin: Red Sea and Western Indian Ocean – from the Gulf of Aden to East Africa
Colouration: Brilliant yellow body with narrow vertical black stripes; bold black facial mask bordered by white; bright yellow fins with orange highlights

Summary

The Red Sea Raccoon Butterflyfish (Chaetodon fasciatus) is a spectacular and iconic species, instantly recognisable for its bold black mask and radiant yellow body. While not reef safe due to its coral-feeding habits, it thrives in spacious, well-maintained FOWLR aquariums with live rock, stable conditions, and a diverse diet. Peaceful, hardy, and visually captivating, this butterflyfish is an outstanding centerpiece for advanced marine aquarists seeking a vibrant and dynamic addition from the Red Sea’s coral reefs.