Three Band Pennant Butterflyfish
Three Band Pennant Butterflyfish
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FAQs Answers to the most common questions.
Can the Three Band Pennant Butterflyfish be kept in a reef aquarium?
No. It may nip at corals, including LPS, SPS, and soft corals, and will nibble at clams such as Tridacna species, so a fish-only system with live rock is the appropriate home.
How large should the aquarium be for an adult?
A minimum of 125 gallons is recommended, with a rocky aquascape providing caves and overhangs plus generous open water for this active swimmer.
Is this butterflyfish suitable for a first saltwater aquarium?
It is rated moderate in care and can be a finicky feeder that is slow to acclimate, so it suits intermediate aquarists best. Frequent, varied feedings during the introduction period improve the odds of success.
All listed sizes are approximate, not guaranteed, and may vary slightly.
Introduction to Three-Band Pennant Butterflyfish (Heniochus chrysostomus)
The Three-Band Pennant Butterflyfish is a graceful and eye-catching species known for its tall dorsal “banner” fin and bold black-and-white banding. Often confused with Moorish Idols due to its similar shape, this species is a much more manageable alternative for aquariums. Native to Indo-Pacific reefs, they are active swimmers that do best in groups or pairs and add constant movement to the tank. Their striking appearance and schooling behavior make them a popular choice for larger fish-only systems.
Care Requirements
Care Level: Moderate
Minimum Tank Size: 125+ gallons
Aquarium Setup: Requires ample open swimming space, stable rockwork, and strong filtration
Three-Band Pennant Butterflyfish are active and benefit from tanks that provide both open water for swimming and rockwork for shelter.
Diet & Nutrition
These butterflyfish are omnivores that adapt relatively well to a variety of prepared foods.
Diet: Omnivorous – Requires a mix of meaty and plant-based foods
Recommended Foods:
- Mysis shrimp, brine shrimp, and chopped seafood
- High-quality frozen blends
- Spirulina-based foods and algae sheets
- Pellets and flakes once acclimated
Offering a varied diet helps maintain their health and coloration.
Lifespan & Growth Rate
Lifespan: 5–10+ years
Growth Rate: Moderate – Can reach up to 6–7 inches
They grow steadily and remain active swimmers throughout their lifespan.
Temperament & Compatibility
Temperament: Peaceful to Semi-Aggressive
Reef Safe? No – Will nip at corals and invertebrates
Three-Band Pennant Butterflyfish do well with other peaceful to moderately aggressive fish but are best kept in fish-only systems due to their tendency to pick at corals.
Common Challenges & Considerations
- Not Reef Safe: Known to nip at corals and sessile invertebrates
- Active Swimmer: Requires a large tank with plenty of space
- Best in Groups: Can be kept singly, but often do better in pairs or small groups
- Misidentification: Often confused with Moorish Idols, which have very different care requirements
Water Conditions
Temperature: 75–77°F
dKH (Alkalinity): 8–12
pH: 8.1–8.3
Specific Gravity: 1.024–1.026
