Raccoon Butterflyfish

Chaetodon lunula

Saltwater Fish Species Group: Butterflyfish Family: Chaetodontidae

Log in or create an account to add this species to your tanks.

Water parameters

Temp 76-80 F Temperature

Maintaining a stable and appropriate temperature is critical for the survival of aquatic life.

pH 7.8 - 8.4 potential of Hydrogen

Measuring the acidity or alkalinity of water on a 0–14 scale, where 7 is neutral, 7 is alkaline.

NO3 1-20 ppm Nitrate

While less toxic than ammonia, high nitrate levels (above 40–80 ppm) are important to monitor because they can cause fish stress, stunted growth, and harmful algae blooms.

NO2 <0.0001 ppm Nitrite

It is a highly toxic, intermediate compound in the nitrogen cycle produced from broken-down ammonia

PO4 0.01 - 0.1 ppm Phosphate

It is essential for plant development but must be managed, as excess levels trigger nuisance algae blooms and inhibit coral calcification.

NH3 <0.1 ppm Ammonia

It is the primary killer of aquarium fish, causing gill damage, stress, and death

Ca 380 - 450 ppm Calcium

Supporting the growth, skeletal structure, and shell formation of corals, mollusks, crustaceans, and coralline algae

KH 8 - 12 dKH Alkalinity

It acts as a shield, neutralizing acids to prevent dangerous pH "crashes" that can harm fish, corals, and plants.

Mg 1200 - 1400 ppm Magnesium

It enables coral growth by supporting skeletal formation, assists in metabolic processes, and ensures that calcium is available for corals, clams, and coralline algae.

SG 1.023 - 1.026 SG Salinity

Essential for maintaining stable, natural water parameters, proper osmoregulation, and stress-free environments for marine fish and corals

ORP 250 - 400 mV Oxidation-Reduction Potential

A higher positive mV indicates clean, oxygen-rich water with high water quality, while low readings indicate high pollution.

About Raccoon Butterflyfish

General information

The Raccoon Butterflyfish (Chaetodon lunula) is a species of saltwater fish that belongs to the family Chaetodontidae. It is named after the distinctive crescent-shaped mask on its face, which gives it its alternative common name. The Raccoon Butterflyfish is typically found in the Western Pacific Ocean, from the Great Barrier Reef to Hawaii, and can grow up to 8 inches (20 cm) in length. This species is popular in the aquarium trade, but can be challenging to care for due to its specific diet and need for a large tank.

Diet & nutrition

The Raccoon Butterflyfish is primarily a carnivorous fish, feeding on a variety of small invertebrates, such as crustaceans, worms, and mollusks. In captivity, they should be fed a varied diet consisting of meaty foods such as krill, shrimp, squid, and other small crustaceans. They may also accept frozen foods and pellets, but live foods are preferred.

Determining sex

It is difficult to determine the sex of Raccoon Butterflyfish visually.

Breeding & spawning

There is limited information available on the breeding and spawning of Raccoon Butterflyfish in captivity.

Diseases

Raccoon Butterflyfish can be prone to various saltwater fish diseases such as white spot disease, velvet disease, and marine ich. These diseases can be treated with a combination of medication and water changes.

Origination

The Raccoon Butterflyfish is native to the Western Pacific Ocean, from the Great Barrier Reef to Hawaii.

Cautions

The Raccoon Butterflyfish is generally considered to be reef-safe, but it may nip at coral polyps and other invertebrates in the aquarium. It may also bully smaller, more passive fish, so it is best kept with similar-sized or larger fish.

Acclimation process

When introducing a Raccoon Butterflyfish to a new aquarium, it is important to slowly acclimate the fish to the new environment by gradually adjusting the water temperature and salinity over a period of several hours. It is also important to ensure that the fish is properly fed and given plenty of hiding places to reduce stress.

All photos

Tap a photo to open the gallery viewer.