Male Spotbreast Swallowtail Angel EXPERT

Also Known As: Blackspot Swallowtail Angelfish

Compatibility and Behavior
The male Spotbreast Swallowtail is a rare showpiece fish that is unmistakable in any aquarium. The body is silvery-white overlaid by multiple narrow, dark to reddish vertical bars along the upper flanks, with a distinctive black spot on the breast and a deeply forked swallowtail caudal fin edged in blue and yellow. Males develop longer, more dramatic tail streamers than females. The overall effect is more reminiscent of a fairy wrasse or anthias than a typical angelfish, and that active, open-water presence reads beautifully in a large reef display.

Temperament is generally peaceful toward dissimilar tankmates, with occasional mild dominance toward other Genicanthus or small planktivores like anthias and chromis. Significant aggression is uncommon when housed alongside similarly sized or larger fish like tangs and wrasses. One male per tank is the rule. Since all Genicanthus begin life as females and one dominant individual transitions to male, keeping two males together isn't a workable long-term arrangement.

Reef safety is about as good as it gets for an angelfish. The natural diet is dominated by zooplankton from the water column, and in healthy reef systems most individuals ignore sessile invertebrates entirely.

Aquarium Requirements
The male Spotbreast Swallowtail needs a large, mature reef with generous horizontal swimming space and strong, well-oxygenated flow. A 120 to 125-gallon tank works for a single male or pair, with larger volumes needed for harems or mixed Genicanthus setups. Rockwork should provide vertical structure and ledges without crowding the tank. Broad, open mid-water swimming lanes are more important to this fish than dense aquascaping. Fully grown adults can reach about 6 to 7  inches and use that open space constantly. Robust biological filtration and efficient protein skimming matter here, since these fish do best with frequent feedings that can add up to a meaningful nutrient load. Feed small and often, with a varied mix of mysis, finely chopped shrimp, copepod-rich blends, enriched brine, and quality marine pellets. Broadcasting food into the current so they can pick it from the water column naturally is the ideal approach.

Specifications
Approximate Size: 5-6”
Diet: Planktivorous omnivore; mysis, enriched brine, finely chopped seafood, copepod blends, quality marine pellets
Origin: Indo-West Pacific, including the Great Barrier Reef, Coral Sea, and western Pacific reef slopes
Care Level: Moderate
Reef Safe: Yes; among the most reliably reef-safe angelfish
Temperament: Generally peaceful; may show mild dominance toward other Genicanthus or small planktivores
Minimum Tank Size: 120–125 gallons for a single male or pair; 180+ for harems
Special Considerations: One male per tank only; requires open swimming space, strong flow, and frequent small feedings; does best in mature, stable reef systems