Staghorn Damsel

Staghorn Damsel (Amblyglyphidodon curacao)
Also known as Clouded Damsel.

Appearance & Behavior

A pale silvery-green body with subtle darker vertical shading gives this active damselfish a softer palette. Provide ample midwater swimming space and separate retreats. Like other damselfish, it establishes a home area and may defend it against approaching tankmates.

Quick Care Guide

• Care level: easy once established in a stable, fully cycled marine aquarium; compatibility requires planning.
• Temperament: semi-aggressive to aggressive as it matures.
• Adult size: 4.5 inches, approximately.
• Minimum aquarium: 50 gallons; use additional space for multiple territories and community tankmates.
• Diet: omnivore; varied small marine foods with an algae component.
• Reef compatibility: generally reef-safe; aggression toward fish is a separate concern.
• Temperature: 72–78°F.
• Specific gravity: approximately 1.023–1.025; keep salinity stable and appropriate for all inhabitants.
• pH: 8.1–8.4.
• Alkalinity: 8–12 dKH; prioritize stability and the needs of the aquarium.

Aquarium Setup & Compatibility

Provide a fully cycled marine aquarium with secure rockwork, caves, and multiple escape routes. Break up sightlines so tankmates can leave the defended territory. Leave open swimming space and maintain effective filtration, good oxygenation, and regular water changes. Fit a secure lid.

Choose compatible, appropriately sized marine companions. Even a comparatively mild damselfish may harass shy fish in a small aquarium, especially once established or breeding. Introduce less assertive residents first where practical and add the damsel later. Introduction order is not a guarantee against aggression.

Groups are possible only with adequate space, multiple retreats, and careful monitoring. Natural grouping does not guarantee compatibility in a confined aquarium. Watch for subordinate fish being excluded from food or shelter. Have a practical separation plan if chasing becomes persistent or causes injury.

Reef & Invertebrate Compatibility

This fish generally leaves coral tissue and most typical ornamental reef invertebrates alone. Tiny crustaceans and larvae may be eaten. Grazing, nesting, or territorial activity can disturb nearby corals; secure frags and monitor vulnerable animals. Reef-safe does not mean peaceful toward other fish.

Feeding

Offer quality marine omnivore pellets or flakes, appropriately sized frozen mysis, enriched brine shrimp, copepods, and algae-containing prepared foods. Provide variety rather than relying on a single food or expecting natural algae and rock fauna to sustain the fish.

Feed small portions twice daily and confirm that every fish receives food. Juveniles may benefit from extra small feeding opportunities. Distribute food across more than one area when a dominant fish monopolizes meals, and remove leftovers to protect water quality.

Introduction & Long-Term Care

Quarantine new arrivals when possible and establish reliable feeding before introduction to the display. Acclimate to temperature and salinity, reduce lighting during introduction, and provide immediate access to shelter. Hardiness is not a reason to expose fish to ammonia or nitrite: never use live damselfish to cycle an aquarium.

Monitor appetite, breathing, body condition, and interactions daily. Increasing aggression with maturity or spawning may require a stocking change even after an initially peaceful introduction. Persistent hiding, missed meals, damaged fins, or relentless chasing calls for prompt attention. Plan for adult size and behavior rather than juvenile appearance.