Are Japanese Swallowtail Angelfish truly reef-safe?

Yes, they are considered completely reef-safe. Unlike other angelfish that graze on coral polyps and clam mantles, the Genicanthus genus feeds almost exclusively on zooplankton suspended in the water column.

Can I keep two males together in the same aquarium?

No, it is highly discouraged. Males of this species are extremely territorial towards each other and will often fight to the death. Keep only one male per tank, either alone or with a group of females.

Why is my female angelfish changing colour and growing stripes?

These fish are protogynous hermaphrodites. If there is no male present in the tank, the dominant female will naturally transition into a male, eventually developing the distinct zebra stripes and dark breast spot.

How often should I feed my Japanese Swallowtail Angelfish?

Because they are highly active planktivores, they burn a lot of energy. It is best to feed them small amounts of high-quality meaty foods two to three times a day rather than one large meal.

Do they need a specific type of water flow?

They thrive in environments with strong, turbulent water flow. Replicating the strong currents of outer reef drop-offs encourages their natural swimming and feeding behaviours.

MarineMarineIntermediate

Japanese Swallowtail Angelfish

Genicanthus melanospilos

The Japanese Swallowtail Angelfish is a completely reef-safe, highly active planktivore famed for its dramatic sexual dimorphism and elegant lyretail fins.

List this species for sale Find Japanese Swallowtail Angelfish near me

Ideal Conditions

Temperature: 22 – 26 °C
pH range: 8.1 – 8.4
Hardness: 14 – 22 dGH
Salinity: 1.02 – 1.025 SG
Adult size: 15 – 18 cm
Minimum for a single adult: 450 litres+
Lifespan: 10 – 15 years
Diet: Omnivore/Planktivore
Water flow: High
Preferred setup: Open swimming space with rockwork hiding places

About the Japanese Swallowtail Angelfish

The Japanese Swallowtail Angelfish is a striking marine species renowned for being entirely reef-safe, a rarity among angelfishes. Belonging to the genus Genicanthus, these fish are pelagic planktivores that feed in the water column rather than grazing on live coral or sessile invertebrates. They exhibit profound sexual dimorphism, meaning males and females boast entirely different colour patterns. Their active swimming behaviour and distinctive elongated tails bring dynamic movement to large marine displays.

Find Japanese Swallowtail Angelfish

Search current listings in your chosen area. If none are available, save an alert and we’ll let you know when a match is listed.

Find locally Check compatibility Add to a Setup

Availability alerts only use public sale listings. Adding this species to a Setup updates your private records.

Is it right for your tank?

Check Japanese Swallowtail Angelfish against a habitat you already keep. We compare water type, temperature, pH, adult size, group needs and everything living there.

Where Japanese Swallowtail Angelfish comes from

Native range

Indo-West Pacific, Great Barrier Reef, Ryukyu Islands

Countries / regions

Indonesia, Philippines, Australia, Fiji, Japan

Habitat

Outer reef slopes, drop-offs, and areas with rich coral growth and strong currents.

Commonly found at depths between 20 and 90 metres, feeding on zooplankton in the water column.

Similar species

Lamarck's Angelfish
Genicanthus lamarck
Bellus Angelfish
Genicanthus bellus
Watanabe's Angelfish
Genicanthus watanabei

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

View all compatibility

Fairy Wrasses
Cirrhilabrus spp.
Peaceful, active reef fish that occupy similar water columns without competing aggressively for territory.
Great
Tangs
Acanthuridae
Herbivorous tangs generally ignore planktivorous angelfish, provided the aquarium is large enough to prevent spatial disputes.
Great
Anthias
Anthiadinae
Share a similar mid-water planktivorous feeding habit and add dynamic, peaceful movement to the display.
Great
Other Genicanthus Angelfish
Genicanthus spp.
Males are highly intolerant of other Genicanthus males. Keeping multiple species or multiple males usually results in fatal aggression.
Compatible with caution
Large Groupers
Epinephelinae
Large predatory fish may view the angelfish as a food source, particularly at night.
Not recommended

Current marketplace listings

Checking the marketplace…

See all Japanese Swallowtail Angelfish listings

Public Wanted requests

No open requests for Japanese Swallowtail Angelfish in this market yet.

Looking for Japanese Swallowtail Angelfish?

Search current listings near you, or post a wanted request so local sellers know what you’re looking for.

Search Japanese Swallowtail Angelfish listings Post a wanted request