Saltwater Fish
Chaetodon quadrimaculatus
Chaetodon quadrimaculatus - Fourspot Butterflyfish

Chaetodon quadrimaculatus (Fourspot Butterflyfish)

Species Description…

Scientific Name: Chaetodon quadrimaculatus
Common Name: Fourspot Butterflyfish
Species Group: Butterflyfish
Habitat: Reef Safe with Caution
Care Level: Intermediate
Temperament: Peaceful
Diet Type: Omnivore
Role in Aquarium: Showpiece Fish
Max Fish Length: 7 (inches)
Min Aquarium Size: 75 (gallons)
Native Range: Indo-Pacific, including reefs around Japan, Indonesia, and the Great Barrier Reef

Overview

  • Native to the Indo-Pacific, frequently found in coral reefs, lagoons, and reef slopes.
  • Named for the four distinct black spots on its body, contrasting with its yellowish hue.
  • A relatively hardy species that can adapt to captivity with stable water conditions.
  • Often observed in pairs or small groups, particularly in coral-rich areas.
  • Best suited for an aquarium with well-maintained water quality and plenty of live rock.

Feeding

  • Omnivorous, feeding on coral polyps, small invertebrates, and algae in the wild.
  • Requires a diet rich in sponge-based foods, frozen mysis shrimp, and marine algae in captivity.
  • May take time to transition to prepared foods, but offering a varied diet improves success.
  • Multiple small meals per day help support digestion and maintain energy levels.
  • A balanced diet promotes bright coloration and strong immune health.

Habitat

  • Prefers coral-rich reef environments with moderate water movement.
  • Frequently found near reef edges and sheltered coastal areas where food is abundant.
  • Aquarium setups should include live rock for natural grazing and hiding spots.
  • Requires stable water parameters with strong filtration to ensure longevity.
  • Providing shaded areas alongside open swimming space supports natural behaviors.

Fish Care

  • Optimal water temperature: 74-80°F (23-27°C) to ensure metabolic balance.
  • Preferred pH range: 8.1-8.4, with a salinity level of 1.020-1.025.
  • Requires regular water changes and proper tank maintenance for long-term health.
  • Not completely reef-safe, as it may nip at corals and sessile invertebrates.
  • Providing a structured environment with live rock supports natural foraging habits.

Compatibility

  • Generally peaceful but can become territorial toward other butterflyfish.
  • Compatible with tangs, angelfish, and other non-aggressive marine species.
  • Not ideal for reef tanks due to its tendency to graze on coral polyps.
  • Should be housed with similarly sized tankmates to prevent competition for food.
  • Providing ample space and hiding areas minimizes territorial aggression.

Aquarium Behavior

  • An active and curious species that enjoys exploring its surroundings.
  • Frequently observed grazing on rock surfaces and interacting with other fish.
  • May take time to adjust to captivity but becomes more confident with proper care.
  • Providing live rock encourages natural grazing behavior and helps reduce stress.
  • Over time, it may develop recognition of its caretaker and display curiosity, especially during feeding sessions.