Passer Angel - Juvenile

Aquarium Requirements

Minimum Tank Size: 300–400 litres (80–105 US gallons)

Temperature: 24–27 °C (75–81 °F)

pH: 8.1–8.4

Specific Gravity (Salinity): 1.020–1.025

Alkalinity: 8–12 dKH

Ammonia & Nitrite: 0 ppm

Nitrate:< 10 ppm

Aquascape:
Provide a mature aquarium with plenty of live rock for grazing and hiding, as well as open mid-water swimming areas. Juveniles benefit from caves, overhangs, or shaded areas to reduce stress while acclimating. Moderate water flow and stable water chemistry are essential for health and growth.

Diet and Feeding

The Passer Angelfish is omnivorous, feeding on plankton, algae, and small invertebrates in the wild.

Recommended Foods:

• High-quality frozen angelfish or marine omnivore formulas

• Mysis shrimp, brine shrimp, and finely chopped seafood (clam, scallop, squid)

• Spirulina- or algae-based flakes or pellets

• Encouraged live rock grazing to replicate natural feeding behavior

Feed 2–3 times daily, offering multiple small portions to support growth and maintain vibrant coloration. Adequate nutrition is especially important during the juvenile stage.

Temperament and Compatibility

Juvenile Passer Angelfish are peaceful and shy, preferring mid-water swimming areas.

Suitable Tankmates:

• Peaceful species such as tangs, wrasses, clownfish, and butterflyfish

• Other angelfish species in very large aquariums with sufficient territories

Avoid:

• Aggressive or highly territorial species that may stress juveniles

With time and acclimation, juveniles gradually become more confident and active in the tank environment.

Reef Compatibility

✅ Reef Safe

This species is generally reef compatible, rarely harming corals or sessile invertebrates when adequately fed.

Best Practices:

• Introduce to a mature reef aquarium

• Provide sponge- and algae-rich foods to reduce opportunistic coral nibbling

• Ensure sufficient hiding spaces during the juvenile stage

Additional Information

Maximum Size: 18–20 cm (7–8 inches)

Lifespan: 10–12 years in captivity with proper care

Difficulty Level: Intermediate

Natural Behavior: Peaceful, mid-water grazer; shy as juvenile, becoming bolder as adult

Origin: Western Pacific – Indonesia, Philippines, northern Australia

Sexual Dimorphism: Pronounced in adults; males develop brighter colors and more elongated dorsal and caudal fins than females

Summary

The Passer Angelfish – Juvenile (Holacanthus passer) is a peaceful, reef-compatible mid-water angelfish, ideal for mature reef aquariums. Juveniles require ample hiding spaces, stable water conditions, and a balanced omnivorous diet. With proper care, they mature into confident, brightly colored adults that thrive for over a decade, maintaining natural grazing behaviors and reef-friendly compatibility.